Earliest African evidence of carcass processing and consumption in cave at 700 ka, Casablanca, Morocco

Abstract

To date, in Africa, evidence for animal processing and consumption in caves routinely used as living spaces is only documented in the late Middle Pleistocene of the North and South of the continent and postdates the Middle Pleistocene in East Africa. Here we report the earliest evidence in a North-African cave (Grotte des Rhinocéros at Casablanca, Morocco) of cut, percussion and human gnawing marks on faunal remains directly associated with lithic knapping activities in the same space and in a well-documented stratified context. Ages for this Acheulean site are provided by the dating of herbivorous teeth to 690–720 ka and 520–550 ka (lower and upper sets) by combined Electron Spin Resonance (ESR) and U-series techniques. Traces of butchery on gazelle, alcelaphin, and zebra bones demonstrate that hominins had primary access to herbivore carcasses. Hominins brought and consumed meat in the cave, as documented by herbivore bones bearing human tooth marks concentrated in a circumscribed area of the excavation. In Africa, this site provides the earliest evidence for in situ carcass processing and meat-eating in cave, directly associated with lithic production and demonstrates the recurrent use by early Middle Pleistocene hominins of a North African cave site 400 000 years before that by Homo sapiens at Jebel Irhoud (Morocco).

Introduction

In Africa, animal consumption strategies related to Acheulean industries (1.8–0.4 Ma) are poorly understood in the early and early Middle Pleistocene record1,2. Very few sites provided stone tools spatially and functionally associated with the exploitation of fauna in a multi-stratified well-dated context. Besides, all early and early Middle Pleistocene Acheulean sites in Africa are open-air sites, except Wonderwerk cave and Cave of Hearths in South Africa, which yielded Early Stone Age (ESA) industries with no associated cut marked bones3,4,5. Some other Southern African sites with occupations assigned to the early Acheulean are located in the “Cradle of Humankind World Heritage” area. That is the case of Sterkfontein Member 5 West or Swartkrans Members 2 and 3, which have yielded ESA industry and cut marked bones, but either mixed with younger material or not definitely associated, and both are in a pitfall karstic context6. The only South African Acheulean site providing cut marked faunal remains recovered in primary association with artefacts, is that of the open-air site of the Elandsfontein dune (~1.0–0.6 Ma)7.

Among the oldest Eastern Africa Acheulean open-air sites, the Kokiselei and Konso excavations provided vertebrate remains, some with cut and percussion marks8,9,10,11. FLK West at Olduvai Gorge (~1.7 Ma) also provided evidence of fauna consumption associated with large-sized tools probably by early Homo erectus sensu lato12.The slightly younger site of OGS-12 at Gona (~1.6–1.2 Ma) yielded a faunal assemblage with evidence of cut marks (slicing marks) and hominin-induced bone breakage13. At Garba IVD (~1.6 Ma) at Melka Kunture, a rich faunal assemblage was recovered together with an early Acheulean industry. Nevertheless, faunal remains are affected by a strong hydraulic action and they do not preserve the original surfaces. Percussion impact points and small percussion flakes are documented, while striae produced by lithic tools are almost completely absent14,15. Peninj Acheulean sites (~1.5 Ma) have lithic artefacts with some fossil bones resulting from hominid behaviour. It has been argued that the scarcity of fauna in these sites must reflect a behavioral strategy because it cannot be entirely explained through taphonomic constrains16,17,18. At Olduvai Gorge, in Upper Bed II, the BK site (~1.33 Ma) yielded an Acheulean assemblage along with evidence of the exploitation by Homo erectus s.l. of big game such as Pelorovis and Sivatherium. Green bone breakage, percussion notches and cut marks are frequent and their location indicates acquisition by more active strategies than scavenging19,20. Finally, in the Okote Member of the Koobi Fora Formation, northern Kenya (~1.6–1.5 Ma), we have abundant evidence of butchery (cut and percussion marks) with no associated stone tools21,22,23.

The long stratigraphic sequences of East Africa include a limited number of sites in the 1.4–0.7 Ma range, several of which are of uncertain age24,25,26,27,28,29,30. At West Turkana, no sites are known between Kokiselei 4, dated to 1.76 Ma, and Nadung’a 4, dated to ~0.7 Ma26. Despite a spatial association of stone tools and bones retrieved from an in situ excavation, this latter site yielded artefacts but no butchery marks on carcasses31. At Gombore II-2 (~ 0.7 Ma) at Melka Kunture, some cut marks indicate defleshing and disarticulation of hippopotamus carcasses32,33. At Olduvai, only JK34 in Bed III yielded substantial concentrations of fauna and stone artefacts.

The East African sites of the late Early/early Middle Pleistocene are either devoid of fauna or, when present, fossils are not definitely associated with stone tools. This is also true when Acheulean technology appeared in North Africa, where most discoveries lack a stratigraphic context35,36,37,38,39,40,41,42. As regards the Early/Middle Pleistocene, the only known North African Acheulean sites providing industries and associated faunal remains in a stratigraphic context are located in Maghreb: Tighennif (~1 Ma, Algeria) and level L of Thomas Quarry I (~1.2–0.8 Ma, Morocco). Unfortunately, given the lack of taphonomic data in the former site, and the bad bone preservation in the latter, little is known about butchery and carcass processing for that period43,44,45.

Acheulean industry, human and faunal remains are documented in the more recent deposits of the ‘Grotte à Hominidés’ of Thomas Quarry I46,47. However, taphonomic analyses have shown that the carnivores were the main agents of faunal accumulation, including that of some of the human remains, as both ends of a human femoral shaft fragment present notches, polishing and tooth marks left by a hyena48. Later, in North Africa, in the Middle Pleistocene cave site of Jebel Irhoud, there is evidence of in situ processing of herbivore carcasses, associated with little lithic on-site production and fire use, indicating prolonged occupation and hunting activities49.

Here we report on the first find of an in situ cave assemblage of cut, percussion and human gnawing marks on faunal remains directly associated with a rich Acheulean industry at Grotte des Rhinocéros (GDR), Oulad Hamida 1 Quarry, dated to c. 700 ka.

Site Presentation

The ‘Grotte des Rhinocéros’ was discovered in 1991, within the frame of the France-Morocco cooperative program Casablanca50, at Oulad Hamida 1 Quarry, an extension of the former Thomas III Quarry, located 1 km from the current Atlantic coast (Fig. 1a). At the moment of the discovery, the quarry was active and had already destroyed the back part of the cave; only the lower part of the stratigraphy was visible. Systematic excavations were performed in 1996 and pursued from 2005 to 2009. These excavations yielded a rich Acheulean lithic assemblage associated with a rich, diverse fauna in a well-established stratigraphic context (see Supplementary Information Fig. S2). It was the first Moroccan Acheulean site dated by ESR51,52 and was chosen as the type-locality for the Second Regional Acheulean (SRA)53 (see Supplementary Information). The cave belongs to an early Middle Pleistocene shoreline of the Oulad Hamida Formation. The chronostratigraphic position within the succession of Pleistocene paleoshorelines at Casablanca indicates an age older than MIS 15 for its formation53,54 (and see the SI references 5 to 7). It is a large marine cavity of unknown total length, whose minimum dimensions at the bottom intersected by the quarry face are about 7 m high and 12 m wide (Fig. 1b). The cavity was filled by a continental 7 m-thick stratified accumulation of calcareous sandy materials divided into two main lithostratigraphic sets: the upper set (units 1 to 4) and the lower set (units 5 to 6) (see Supplementary Information Fig. S1). The deposition of fine sediment by low energy processes (aeolian and runoff) is responsible for the good preservation of the archaeological assemblages composed of bones and lithics (Fig. 1c–e). Facies and architecture of the deposits rule out the hypothesis of a pitfall accumulation.

Figure 1
figure1

Location, US-ESR dates and vertical distribution of the remains of the GDR site. (a) Location of the site on the Moroccan Atlantic coast. GDR: Grotte des Rhinoceros, GH: Grotte des Hominidés, SAQ: Sidi Abderrahmane Quarry (drawings by M. Rué). (b) Oblique view of the site and limits of the present-day cave (photo M. Rué). (c) Projection of the US-ESR dates (ka) on an orthophoto of the infilling (photo D. Lefèvre). (d) Projection of the US-ESR dates and all the coordinated remains (drawings by M. Rué). (e) Projection of the human-modified remains presented in this article (only those with XYZ coordinates) and of the hominin incisor (drawings by M. Rué).

Results

Dating

New combined ESR with U-series dating of seven bovid and rhinocerotid teeth from both lower and upper sets give ages of 720–690 ka and 548–522 ka respectively (see Supplementary Information; Tables S1 and S2; Figs. 1c and S1a). The homogeneity of the external dose rate allowed the calculation of an isochron age of 696 ka in good agreement with the oldest ages (unit 5). Three bovid teeth coming from this unit exhibit high uranium content in enamel probably limiting the creation of electron traps and leading to an underestimation of the DE (Equivalent Dose) and of the ages ranging between 408 and 421 ka (Fig. S3). This suggests that teeth have undergone a complex geochemical history such as uranium uptake in the enamel after the deposition while the dentine underwent a slight leaching probably during a humid period contemporaneous with a highstand sea-level (MIS17; see Supplementary Information). Two other teeth localized in unit 2 yield ages of 548–522 ka in agreement with the stratigraphic sequence. Our results are consistent with those obtained by Rhodes et al.52 on fossils from the lower set.

Faunal assemblage

The faunal assemblage lacks Homotherium and Metridiochoerus and looks younger than that of Tighennif in Algeria, a site that may be about 1 Ma55, but the GDR rodents are closer to those of Tighennif than to those of Jebel Irhoud (Morocco), recently dated to c. 315 ka49. Additionally, the large number of extinct forms (see Supplementary Information), and the similarities of some of them with early Pleistocene taxa point to an early stage of the evolution of Middle Pleistocene assemblages, at certainly more than 0.5 Ma, which is consistent with the combined US-ESR dating.

Bovids are largely dominant among herbivores throughout the sequence, especially gazelles and Alcelaphini, mainly represented by cf. Parmularius. Gazelles and Alcelaphini are equally distributed among all age classes (Tables S3 and S4). Small-(S1–2) and medium-sized (S3) bovids have the same skeletal profiles, i.e. the predominance of cranial remains (without isolated teeth) and upper limb elements. The white rhinoceros Ceratotherium mauritanicum comes right after with 16.1% and 19.1% respectively of the NISPt in the lower and the upper sets. Both young and old individuals dominate. The rhinoceros skeletal profile is slightly different from those of bovids, with the decrease of limb extremities whereas axial elements are more common (Fig. S4).

Many other large mammals are present but in low quantity, such as zebras, warthogs, camels, an elephant and the Primate Theropithecus oswaldi.

Carnivores are more common in the upper set with a rate of 19.1% of the NISPt against only 7.6% in the lower set. In both series, the jackal Lupulella mohibi dominates, representing about half of the carnivores. It is followed by hyenids, large felids, ursids and some small carnivores. A few coprolites have been recorded in the two assemblages.

Finally, the unit 5 also yielded a lower second incisor of archaic hominin (Fig. 2).

Figure 2
figure2

Surface model of the hominin incisor from unit 5 produced from CT data (by J.-J. Hublin). GDR09-8448 (lower set) is a well preserved left second incisor. It does not display any pathological conditions. The crown is worn and a substantial surface of dentine is exposed. Still, a large proportion of enamel is preserved above the cervix. Considering the rapid wearing of incisors in most Middle Pleistocene hominins, this tooth likely belonged to a young adult. The lingual surface of the crown displays a moderate shoveling, with well-developed mesial and distal ridges. The two ridges join a moderately expressed lingual cingulum out of which emerges a basal tubercle centrally placed. The mesial face is much wider than the distal face and both display well developed interproximal attrition facets. The buccal surface of the crown is supero-inferiorly convex, prolonging the profile of the buccal side of the root. The mesio-distal diameter of the crown (6.8 mm) is well within the variation observed among Middle Pleistocene European and African archaic hominins119, but the bucco-lingual diameter of 6.7 mm is at the lower limit observed in these groups119. The root has an ovoid section. Its apex was broken post-mortem and the preserved portion is 14.8 mm long from the lingual cervix.

Taphonomic context

The limited differential bone preservation and the well-preserved bone surfaces indicate a very good state of assemblage preservation (Fig. S5). The percentages of surface illegibility are small (6–12%), but there are differences between levels with more badly preserved surfaces being more common in the upper set (Tables S5 and S6) (Fig. S5). The good bone preservation is confirmed by the low bone destruction values (Tables S3 and S4). Most of the articular portions of long bones have been spared. Indeed, the epiphysis/diaphysis ratio is high for the two series, showing a good preservation of the spongious parts of the long bones.

The carnivore tooth-marks (pits, scores, punctures, notches) and ingested remains are more numerous at the base of the sequence and all species have been impacted, including jackals and hyenas (Tables S7 and S8; Fig. 3a–c). About 20% of the NISP of the bone remains in the lower layers and 15% in the upper ones present carnivore tooth-marks (Fig. 3a,c); some of them have been ingested. Some coprolites and ingested bones indicate the involvement of large carnivores, but the majority of the tooth mark and coprolite measurements show that they were left by the jackal. Carnivore tooth marks are equally distributed along the herbivore long bone elements, present on the median shaft (22.7%), shaft ends (21.9%) and articular portions (28.6%).

Figure 3
figure3

Non-anthropogenic bone surface modifications (lower set). Photos and digital microscope images by C. Daujeard. (a–c) Green bone breakage on a distal left tibia of an Alcelaphini (GDR09-8054). Notice the associated porcupine and carnivore tooth marks on the extremity of the bone fragment. (d) Shaft fragment of a bovid tibia with porcupine tooth marks (GDR09-7771). (e) Micro-abrasion striations on a distal shaft fragment of an alcelaphin femur (GDR09-8101).

Porcupine tooth marks are also present in greater quantity in the lower set, with about 4% of the remains, against only 0.2% in the upper part (Tables S7 and S8; Fig. 3b,d). Most of the rodent marks are parallel scores and striations located on the edges of the bones, fracture angles or salient parts (Fig. 3d).

Numerous abrasion striations are present in the lower part of the sequence with 7% of the total readable bone elements in this set while, by contrast, they are almost absent in the upper set with only one bone striated (Tables S7 and S8). The abrasion process did not cause other damage than random striations (Fig. 3e). Polishing (smooth edges) remains rare and equivalent in the two series (1–2%). Linear abrasion marks are dense networks of very fine, superficial and overlapping long and straight striations, randomly located and oriented (Fig. 3e). These traces result from the mechanical friction of the bone surfaces against the sediment grains or lithic artefacts by trampling or limited sediment movements.

Root marking, calcite encrustations and desquamation are stronger in the upper layers, partly covering some surfaces. Inversely, black colorations (manganese oxides) and cracking are more frequent in the lower set (Tables S5 and S6). Nevertheless, the assemblages appear to be well preserved and only slightly affected by post-depositional bone surface alterations (weathering does not exceed stage 2 all over the sequence).

Long bone fragmentation is intensive, therefore identification indices are moderate. Despite the presence of a few whole long bones (3–5%), we observe the same low bone completeness indices for the two series (Fig. S5). The cause of this intensive fragmentation is mainly green bone breakage, especially for ungulate long bones with 81.2% and 65.8% respectively of broken bones in the lower and the upper sets (Tables S5 and S6). Post-depositional dry bone fractures are also common. Green and dry bone breakage are much more common in the lower set (Fig. S5a). Regarding the size categories for the whole bone assemblages (including sieving remains), more than 60% of the remains measure between 0 and 25 mm (Fig. S5b). In the lower set, ungulate long bones show good shaft length and circumference preservation, with L1 and L2 categories nearly equivalent. Some shaft cylinders are also present (Fig. S5c).

Human induced marks

Beside these natural alterations on faunal remains, a number of bones display conclusive evidence of human-made marks (Figs. 4 and 5; see Methods section).

Figure 4
figure4

Cut marks on herbivore remains (lower set). (a–e) On a metacarpal proximal shaft fragment of an Alcelaphini (S3, cf. wildebeest) (GDR09-7159): (a) proximal view with some porcupine teeth marks and (b) medial side with a dozen long and parallel incisions. We observe clear shifts in the trajectory of some striations crossed by post-depositional cracks (c). Some of which have fork-shaped ends (d). Notice the V-shaped linear groove with internal striae for some of them (e). (f–h) On a radius-ulna medial shaft fragment of a zebra (Equus mauritanicus) (GDR09-7070): (f) view of the lateral side of the medial shaft with several dozen short and parallel incisions. Most of them have internal microstriations (g,h). All of the butchery marks (a–h) may be due to de-fleshing and/or disarticulation (images a,b, and f by C. Daujeard; Stereo microscope images c,d and g by G. Merceron and SEM images e and h by S. Pont).

Figure 5
figure5

Cut and percussion marks on herbivore remains (lower set). (a,b) View of a dozen short and parallel incisions present on the proximal part of the external side of an alcelaphin rib (GDR09-6841). (c,d) Notice the shoulder effects and the V-shaped cross sections of some of the cut marks. These cut marks are interpreted as de-fleshing. (e) Percussion notch on a tibia shaft fragment of an indeterminate bovid S3 (GDR09-7438) (images a, b, c and e by C. Daujeard, c is a Stereo microscope image; SEM image d by S. Pont).

A total of 37 cut-marked specimens have been observed at GDR: 28 in the lower set and 9 in the upper one, which represent about 1% of the total readable bone elements for the two series (n = 2659 and 976 respectively; see Methods) and 3.8% and 5.5% of the identified bone remains (n = 531and 127) (Tables S7 and S8). Most of the marks are V-shaped incisions and display the same orientation within clusters, but are of various lengths, widths and depths. They occasionally present microstriations, shoulder effects, and fork-shaped ends (Figs. 4 and 5). Those marks are often isolated and circumscribed to muscle insertion reliefs. Other types of marks – superficial, parallel and more diffuse – are interpreted as scraping marks.

Various bovids (gazelles, wildebeest and Parmularius), zebras and unidentified bones display cut marks as well. They include long bones, ribs, vertebrae and pelvis, but only one short bone, a bovid calcaneum shows cut marks resulting from tarsus disarticulation. No clear butchery striations have been identified for the rhinoceros, as only three specimens (two ribs and one scapula) bear possible butchery marks unfortunately associated with trampling, carnivore and rodent modifications. Cut marks are unequally distributed along the long bone portions, with 12.5% for midshaft portions, 8.4% for shaft ends and 3.4% for epiphyses. For the two series, we have an equivalent number of cut-marked upper and intermediate long bones, respectively five and eight. The metapodials are slightly fewer with three cut-marked elements.

Percussion marks (flakes, notches or pits and grooves with microstriations) are rare, being present on less than 1% of the total readable bone elements and 4% of them being associated with green bone fractures (Fig. 5e); these percentages are lower than carnivore tooth marks (Tables S7 and S8). This suggests the greater involvement of carnivores in the breakage process. Most (about 75%) of the cut-marked specimens show green bone fractures, some of them associated with percussion marks, testifying to marrow recovering by hominins. Almost all of the percussion marks occur on zebra or bovid long bone shafts.

Some peculiar marks have been observed on four bone elements coming from the lower lithostratigraphic set. We identified them as human tooth marks (Fig. 6). They are shallow linear marks, crescent-shaped pits with internal and external scratches, triangular puncture marks and peeling on the surface. They are not found isolated, but clustered on the same element: the shaft portions of an alcelaphin rib and a gazelle metatarsal, the ilium of a bovid and a bone fragment. The extremity of the rib shows a green bone fracture with classic peeling associated with scores and butchery striations.

Figure 6
figure6

Human tooth marks on herbivore remains. (a–c) On a shaft fragment of a gazelle metatarsal (GDR09-7293, lower units). (d–f) On a shaft fragment of an alcelaphin rib (GDR0-7673, lower units). Notice that some human tooth marks are associated with anterior butchery marks (f) (images a,b,d and e by C. Daujeard; Stereo microscope images c and f by G. Merceron).

Below, we list the entire cut marked specimen by taxa, adding a complete description of the butchery marks and interpretations (Table S9).

The lower stratigraphic set

Equus: Cut marks on the zebra are documented on two mid-shaft fragments of a radio-ulna and a femur. About 40 striations are present on the lateral side of the radio-ulna shaft, along the fusion zone (Fig. 4f–h). They are short oblique and parallel incisions of variable depth and breadth. Some of them present shoulder effects, fork-shaped ends and microstriations resulting from defleshing. Six cut marks are present on the femur, on the internal face of the greater trochanter. They are thin and long incisions, parallel to the long axis of the bone, and also indicate the defleshing of the meaty part of the bone.

Gazella: Seven cut marked gazelle bones were observed. They are shaft fragments of a femur, a humerus, a metatarsal and an ulna. Long and oblique striations resulted from the defleshing of the meaty parts of the proximal segments of the limb (femur and humerus). Besides, some shorter cut marks occur on the lateral epicondyle and above the olecranon fossa of the humerus and are due to the disarticulation of the humerus-ulna joint. Marks on the metatarsal along the posterior gutter are interpreted as a skinning process. The ulna shows three long- and medium-sized oblique marks on its medial shaft, possibly due to defleshing. Two fragments of pelvis (ilium) and one spinous process of a thoracic vertebra also present butchery striations due to defleshing.

Parmularius: Six shaft fragments of long bones of Parmularius (one humerus, one radius, one femur and three tibias) show cut marks. Two rib fragments present striations on the external side (Fig. 5a–d). All of these elements present incisions resulting from the defleshing and only two, the femur and the radius, also have scraping marks, possibly related to periosteum removal. Most of the marks have microstriations, shoulder effects and fork-shaped ends. One of the two ribs shows human tooth marks and percussion impacts superimposed onto the cut marks (Fig. 6d–f).

Connochaetes: One medio-proximal fragment of a wildebeest metacarpal shows two clusters of long- and medium-sized, V-shaped, oblique incisions located on the anterior and medial sides of the proximal shaft (Fig. 4b–e). They present microstriations, shoulder effects and fork-shaped ends. They are interpreted as resulting from the defleshing and disarticulation of the carpo-metacarpal joint. On this specimen, we observed clear shifts in the trajectory of some striations crossed by post-depositional cracks, proving that the striations occurred prior to the cracks (Fig. 4c).

Unidentified remains: Ten cut marked specimens are non-identified, belonging to fragments of long bones, ribs and short articular bones. Three of them are indeterminate bovids of S2–3 (tibia medial shaft fragment and long bone unidentified elements). One is a calcaneum fragment of an indeterminate bovid of S3–4. Only one cluster of cut marks on the tibia corresponds to scraping marks. Otherwise, all marks are incisions of various dimensions and various depths, mostly parallel to each other and oblique in relation to the long axis of the bones.

The upper stratigraphic set

Equus: One medial shaft fragment of a zebra metapodial presents five cut marks on its posterior side. Those marks are short- and medium sized oblique, V-shaped striations, parallel or not. The process may be defleshing or skinning.

Gazella: Two fragments of pelvis and radius of gazelles show cut marks. Two clusters of striations are located on the anterior muscle insertion surface of the ilium. Marks are short, oblique and parallel or not. They are interpreted as the disarticulation of the femur-pelvis joint. The radius has three clusters of incisions and scraping marks on the medial shaft portion, related to defleshing and periosteum removal.

Parmularius: Three fragments of ribs of a size 2–3 bovid (cf. Parmularius) present cut marks. Incisions and scraping marks were recorded on the external sides of the ribs and medial shaft of the long bone. Most of the marks have microstriations and some have shoulder effects and fork-shaped ends. Defleshing and scraping are the two processes recognized.

Unidentified remains: Two indeterminate fragments and one fragment of an indeterminate long bone of a S2–3 bovid present cut marks. They are oblique and clustered incisions with fork-shaped ends and scraping marks.

Discussion

The higher proportion of cracked and of biologically modified bones (by porcupines, carnivores and humans) in the lower part of the sequence suggests a longer exposure for these remains. Likewise, the natural abrasion striations occur only in the lower part, probably because of a longer exposure to animal and human trampling. No marks of carnivores and humans are found superimposed or present together, giving no indication of the order of events and demonstrating distinct events of butchery and carnivore activity56. The very low rates of cut (~1%) and percussion (~0.5%) marked specimens in relation to the carnivore tooth marks (~4–8%) suggest that hominins were not the main agent of accumulation (Tables S7 and S8). The number of carnivore tooth marks and their even distribution among herbivore long bone ends and midshaft portions indicate that they were an important agent of accumulation, or at least of bone surface modification and bone-breaking. Nevertheless, the presence of some whole bone elements and the relatively high ratio of epiphysis/diaphysis (0.4–0.6; Tables S3 to S6) do not support a strong contribution of the hyenids to the taphocenosis, nor the exclusive use of the cave as a den. The dimensions of tooth marks and coprolites indicate that different sizes of carnivores are responsible for the modifications and that the jackal is the most important destructive agent.

By contrast, the role of hominins was reduced with some limited butchery evidence (cut and percussion marks). Yet, the greatest frequencies of cut marks on the midshafts indicate the defleshing of the meaty long bone portions. The ratios of cut-marked meaty-bone mid-shaft portions to cut-marked metapodial mid-shaft portions, which is 19/3 for the lower set and 3/1 for the upper set, actually suggest that hominins had primary access to at least some carcasses19. As well, the meaty upper and intermediate limb bones which have a nearly equivalent number of cut marked elements, respectively 5 and 7 in the lower set while only two lower limb bone elements (metapodials) have been cut marked, also point to primary access19.

The age and skeletal profiles for S1 to S3 bovids are in favour of predation activities, while larger ungulates such as zebras, S4 bovids and rhinoceroses seem to have been scavenged instead. Part of the faunal remains have been accumulated by carnivores and to a lesser extent by human transport, but the moderate bone destruction points also to a non-biotic origin.

The presence of numerous rhinoceros carcasses in the cave is intriguing. Even if we take into account the thickness of the skin and flesh of this very large mammal and the illegibility of some bone surfaces, we note a total absence of human-made marks and by contrast the presence of a few carnivore tooth marks. The presence of more than a dozen skulls (some broken and with disarticulated jaws), along with ribs, limb parts, pelvises and scapulas, would suggest the carnivore and/or human exploitation of animals in situ, but this issue requires further investigation.

At GDR, the spatial and temporal organization differs from that of the earlier Acheulean open-air sites in Eastern8,9,12,13,19,20,32 and Northern Africa43,44,45. Indeed, the oldest evidence of butchery in Africa occurred in open-air sites, where hominins had early access to carcasses in kill- or active scavenging-sites, occasionally visited by carnivores57,58,59,60,61,62. Some “central-place” early Acheulean sites have been identified in Africa, often related to megafauna exploitation dating to less than 1.7 Ma12,20, but still in open-air contexts. In most of these sites, it is difficult to draw conclusions regarding site function, hominid access to the carcasses, meat consumption, transport of carcass portions, and interactions between humans and carnivores6,22,63. Moreover, post-depositional agents often affect archaeological assemblages and limit the interpretations so that in situ animal consumption is more often taken for granted than proved by detailed taphonomic analyses. At GDR, hominins carried out subsistence activities in the cave, at least on some small- to large- sized herbivores, mostly on gazelles, zebras and Alcelaphini, and thus configured caves as “central places” in the landscape. The abundant lithic industry associated with fauna remains in both archeological units with huge flaking activity and LCT’s (bifaces and cleavers) shaping give weight to this interpretation. Finally, according to experimentations64, fork-shaped marks are among the variables capable of discerning cut marks produced with lithic handaxes. This morphology is frequent here, and possibly related to the abundance of LCT’s in the lithic assemblage.

Occupation of caves as persistent dwellings is an important behavioral marker in human evolution. It provides many advantages such as protection against environmental events, fire maintenance, as well as the development of a structured space for prolonged secondary butchery and feeding65,66,67,68. Here, the association of cut-marked remains and stone tools in a cave context within a taphonomically interpretable assemblage demonstrates that this important step occurred in Northern Africa at about 700 ka. Indeed, GDR is one of the few early Middle Pleistocene sites – and for now the only one in Africa – in which human animal consumption is directly associated with Acheulean stone tools manufacture in a cave6,32,34,43.

Methods

Material for taphonomic analysis

The taphonomic analysis concerns all the faunal remains of large mammals coming from the 2007 to 2009 excavations, including those recovered by sieving. A preliminary taphonomic analysis was recently published for the faunal assemblage from earlier excavations69. Length, breadth, thickness, breakage and bone surface modifications were recorded for all 3D plotted elements and for all identified ones (non-plotted included). Indeterminate sieving fragments were only used for counts, fragmentation studies (type and size classes) and biological agents (carnivores, rodents or humans). We report here the total number of remains (NR), the number of identified specimens taxonomically and anatomically (NISPt and NISPa) as well as the minimum number of individuals (MNI). The sample has been divided into two main assemblages coming from the upper set and the lower set. The first one contains a total of 1097 remains and the second one 2873 remains (Tables S3 and S4). For indeterminate remains we defined the type of specimen (compact; spongy; tooth; long or short bones) and established size and weight categories (Table S10).

Carcass transport strategies

In order to discuss transport strategies and/or differential bone preservation, we used the percentage of Minimal Animal Unit70 (MAU) and the bone bulk density71,72. Carcasses were divided into seven main anatomical parts: head (skull, mandibles, isolated teeth excepted); axial elements (vertebrae, ribs, sternum); forequarters (scapula, humerus, radio-ulna); forefoot (carpal, metacarpal); hindquarters (pelvis, sacrum, femur, tibia, patella); hindfoot (tarsal, metatarsal); and indeterminate foot (phalanges, sesamoids, metapodials). Ontogenic age-at-death is based on dental eruption and replacement patterns and then on tooth wear. We used the method of Munro et al.73 to assess the age of gazelles, Bunn and Pickering74 for the other bovids, and Hitchins75 and Tong76 for rhinos.

Breakage processes

The identification of the type of breakage (green, dry or recent bone fractures) was made based on the fracture colour, shape, feature and angle77. The identification of the breaking agent is based on the morphology of the percussion marks and associated bone surface modifications78,79. The recorded percussion marks are medullary or cortical percussion notches (negative flake scars); impact flakes (positive flake scars) or percussion pits78,80. The shaft fragments were differentiated by size and circumference classes77.

Bone surface modifications analysis

In order to distinguish depositional and post-depositional damages, all bone surfaces were observed using the naked eye and a 10x hand lens under high incident light81, with some further assessed using a Digital microscope (Dino-Lite AD7013MZT; 20x to 200x). We also made a selection of key samples for higher resolution and magnification images with a Leica S8 APO stereomicroscope (10x to 80×), a scanning electron microscope (SEM) and a 3D Digital Microscope (Hirox). Those key samples were selected according to their type and intensity of bone modifications, for example we prioritized the elements bearing the most visible and clear bone modifications (human, animal or trampling marks).

The number of bone remains analyzed for the bone surface modifications (NRtaph) is 386 for the upper set and 986 for the lower set (Tables S3 and S4). However, to quantify cut marks, and other biotic modifications, we took into account the sieved remains. Only specimens with visible bone surfaces were taken into account in the percentages. We excluded the bone specimens having a completely illegible bone surface (=0) due to post-depositional alterations. Indeed, we categorized the bone elements of our series accordingly: 0 = unreadable bone surfaces; 1/3 of readability; 2/3 of readability and 1 = entirely readable. The total number of observed (readable) elements are 976 and 2659 for the upper and lower sets respectively (Tables S7 and S8).

The type and the location of modifications were recorded. We distinguish between those made by rodents, carnivores or hominins, as well as climatic and edaphic modifications (including cracking, desquamation, polish, concretion, root etchings, natural abrasion, chemical corrosion and oxides colorations), on the basis of the criteria defined in the literature81,82,83,84,85,86,87,88.

Carnivore and rodent traces

Carnivore marks were classified as follows: pits, punctures, scores, notches or corrosion by gastric acids and their locations on long bones were recorded86,87,89. We took carnivore tooth mark measurements (maximal length and breadth) into account, as well as tissue location (cancellous bone or articular portions; cortical or median diaphysis; thin cortical bone or diaphysis extremity). While insufficient when taken alone, measuring the tooth marks (especially maximal dimensions) is the most accurate method for establishing the body size of the predator90,91,92. We also measured the coprolites (length, breadth and thickness). Traces left by rodent incisors are parallel, wide or narrow furrows, sometimes including internal micro-striations85,93.

Cut marks identification

Particular attention has been given to cut marks, observed under low (10x−40x) and high magnification (up to 80x with the stereomicroscope and to 200x and more with the Dinolite and SEM). We distinguished natural abrasion striations (i.e. trampling marks) from butchery marks using previous experimental and descriptive works64,83,84,86,88,94,95. We used the following variables to discriminate cut marks from natural abrasion: dimensions (length); width and shape of the cross-section (narrow and wide V-shape); depth (deep, moderate or superficial); internal microstriations; shoulder effect; flaking; trajectory (straight or sinuous linear grooves); isolated or grouped striations and relationship (parallel, non-parallel or overlapping); orientation with respect to the major axis of the bone (parallel, oblique or perpendicular); presence of fork-shaped marks or multiple grooves (in some case of cut marks made with lithic handaxes); frequency and location of the marks on the bone (rather muscle and tendons attachment areas for cut marks and more likely a random location for natural abrasions). Finally, because the morphology of trampling marks can mimic cut marks, even microscopically, only the combination of several of those criteria (morphology, quantity, context, location) allowed us to strongly identify evidence of butchery, i.e. a series of parallel and deep V-shaped grooves with straight and continuous internal microstriations located on some muscle attachment areas are more likely to be cut marks. The association of cut marks with natural abrasion striations is also taken into account in our identification process. Thus, in a contextual approach, we excluded from our counts all remains that displayed possible cut marks found in direct and clear association with natural striations. As stated above, we also excluded all bones with illegible surfaces. Consequently, our cut marked specimen frequency is certainly underestimated. Although Early Palaeolithic assemblages often contain a smaller number of cut marked bones because of the state of preservation and of the onset of carnivorous diet96,97,98, the frequency of cut marked specimens is also a strong and valuable diagnostic criteria to identify human consumption activity.

Once the types of cut-marks, scraping marks or incisions99, were recorded, their location and morphology were used to indicate the related butchering activity including evisceration; skinning; dismemberment; disarticulation; periosteum removal; cutting tendons and de-fleshing22,86. We reported the name of each muscle and tendon affected by the well-located cut marks. Lastly, to differentiate primary from secondary access to the carcass we used the distribution of cut marks both per bone section (ratio of cut marked diaphyses on cut-marked epiphyses) and per bone elements (ratio of cut-marked meaty-bone shafts on cut-marked metapodials shafts)19.

Deciphering human tooth marks

Human tooth marks may be shallow linear marks showing a crescent pit and internal scratches along the bottom of the groove, “double-arched shape” punctures on crenulated edges, triangular puncture marks, or peeling on the surface86,100,101,102,103,104,105. Shallow linear marks could be difficult to decipher with the naked eye and thus necessitate the need be seen at high magnification. Experiments have shown that those marks are usually produced by human incisors103. Thus, at GDR, we paid particular attention to this type of damage, even if its occurrence in sites where multiple accumulators interact is difficult to demonstrate.

Dating methods

The combined ESR/U-series (US-ESR) model takes into account both ESR and U-series data including radioelement contents, isotopic ratios, equivalent dose and external gamma-dose rate allowing for the reconstruction of the uranium uptake history in each dental tissue using a specific U-uptake parameter (p-value)106. The model cannot account for uranium loss. A new model combining ESR and U-series data (called the Accelerating uptake model, AU-ESR) allows to analyse samples exhibiting slight uranium leaching107. The application of the combined approach has been used for dating the entire Middle Pleistocene on both human and animal teeth108,109.

Seven herbivorous teeth, unearthed from the 2007–2009 excavation campaigns, were analysed using the ESR/U-series method at the Geochronology Lab of the department of “Homme et Environnement”, Muséum National d’Histoire Naturelle, Paris. The samples come from two areas: A first zone has yielded 5 teeth (3 bovids and 2 rhinocerotids), corresponding to E15, D16 squares and to the stratigraphical unit 5 very close to the human tooth marks. A second area, excavated earlier, provided two teeth (one bovid and one rhino) in G19, G20 squares (Extended Data Fig. 3). The samples are in a good state of conservation and are embedded in a reddish sediment (Extended Data Fig. 2).

Enamel and dentine were separated mechanically and their radioisotope contents measured by U-series using alpha-ray spectrometry or ICPMS-MC according to standard methods110,111, and gamma-ray spectrometry112. No cement was observed in the selected teeth. Enamel was cleaned on both inner and outer sides to eliminate the effects of external alpha radiation. It was then ground, sieved at 100–200 µm fraction and split into 10 aliquots used for ESR measurements.

Nine of them were irradiated with a calibrated 60Co gamma-ray panoramic source (LABRA, CEA, Saclay, France) from 160 to 11700 Gy.

ESR measurements were performed in a Paris lab at room temperature on an EMX-6 Bruker spectrometer (X band, 9.82 GHz) with a microwave power of 1 mW and with a modulation amplitude of 0.1 mT. A scan range of 10 mT and a scan time of two minutes with a modulation frequency of 100 kHz were used for each spectrum. Each ESR measurement was repeated four times for each dose over different days.

ESR intensities were extracted using the Bruker WINEPR System software from the asymmetric ESR signal between the T1-B2 signal at g = 2.0018113. ESR intensities were fitted by an exponential plus linear function (EXPLIN) using Origin Pro8 software (OriginLab Corporation, Northampton, USA) to determine the equivalent dose (DE). Data were weighted by 1/I2. US-ESR age calculations were carried out with the ESR-DATA program114 which uses an alpha efficiency of 0.13 ± 0.02115 and Monte-Carlo beta attenuation factors116 based on the thickness of tooth enamel and after the removal of the outer layers. The age of some samples exhibiting weak uranium leaching were calculated using AU-ESR model107. The water content was estimated to be 7 ± 3% in the dentine and 12 ± 5% in the sediment (dry weight versus wet sediment in an oven at 35 °C). No water content was taken into account in the enamel. Gamma-ray spectroscopy measurements were performed using a high purity low-background Ge detector to determine specific activity of radioisotopes (U, Th, K) in the sediments including the samples. In situ measurements were performed using a γ-ray portable spectrometer Inspector 1000 Canberra with NaI detector. The dose rate was calculated according to Guérin et al.117. The effect of Ra and Rn loss in each tissue was determined by combining alpha-ray and gamma-ray measurements118.

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Acknowledgements

We thank Mohamed El Hajraoui who co-directed the 1991 excavation and Fatima-Zohra Sbihi-Alaoui who co-directed the successive excavations and the Casablanca Program with JPR until 2010. The Casablanca France-Morocco research program is jointly conducted and supported by the Institut National des Sciences de l’Archéologie et du Patrimoine (INSAP) of the Ministère de la Culture, de la Jeunesse et des Sports/Département de la Culture of the Kingdom of Morocco, the Ministère de l’Europe et des Affaires Étrangères of France, and the Paul Valéry Montpellier 3 University (France). The program is also funded by the Department of Human Evolution of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany and the LabEx Archimede (ANR-11-LABX-0032-01). It has received funding from the Aquitaine Region through the Origines projects, the Collège de France, the Muséum National d’Histoire Naturelle in Paris, and the University of Bordeaux (France). We acknowledge Antony Borel (MNHN), Sylvain Pont (PtME, MNHN) and Gildas Merceron (CNRS, Poitiers University) for the microscopic images (SEM and Hirox). We are also grateful to Mikaela Lui for the English editing.

Author information

Zooarchaeology and taphonomy was carried out by C.D. US-ESR dating was done by C.F., Q.S., E.B.A. and O.T. Mammalian paleontology was done by D.G. Paleoanthropology was done by J.J.H. Geology was done by D.L., M.E.G., M.R., A.Q. and J.P.R. Lithics were studied by A.M., R.G. and J.P.R. M.E.G. discovered the site. Excavations were conducted by V.D., R.G., A.M. and J.P.R. A.M. and J.P.R. were co-directors of the Casablanca Program from 2011 to 2015 and A.M. and D.L. are both co-directors since 2016. C.D. wrote the paper with the contributions from all authors.

Correspondence to Camille Daujeard.

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Daujeard, C., Falguères, C., Shao, Q. et al. Earliest African evidence of carcass processing and consumption in cave at 700 ka, Casablanca, Morocco. Sci Rep 10, 4761 (2020). https://doi.org/10.1038/s41598-020-61580-4

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