Abstract
The Latium area in Italy has yielded rich evidence of Lower Paleolithic sites with both faunal remains, artefacts, and human fossil remains, such as the Ceprano human skull. Many are the sites where lithic industry has been found in association with bone industry. Medium and large animals were a key resource because they provided an enormous amount of meat and fat. However, they were extensively exploited for their bones, rich in marrow, and as raw material for tool production. Bone tools are so far few documented for early period of time and especially for the Middle Pleistocene in Western Europe. We report here evidence of bone tools and their efficiency of use for hominin groups living in the Frosinone-Ceprano basin during the MIS 11/10, a key period which records behavioral innovations and onset of the Neanderthal behaviors. In three sites, Isoletta, Colle Avarone and Selvotta, several bone tools and bone flakes have been discovered (MIS 11/10). They were associated to stone artefacts part of the hominins tool-kit. Technological and use-wear analyses conducted on these bone industries, dated between 410 and 430 ka, yield relevant results to understand the effectiveness of the bones tools found associated with lithic series, including handaxes.
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Introduction
Human–large mammal interactions occurred at many African, European, and Asian sites. In the Lower Palaeolithic, large animals were extensively exploited for their meat, fat, and bone marrow—high-energy nutritional sources—allowing hominins to have a high caloric intake1,2,3,4,5,6, and enabling them to survive over thousands of years.
Furthermore, bones served as raw materials for tool manufacturing, a practice dating back millions of years7,8. Some authors also suggest that bones were used for cosmological and ontological purposes in addition to their use as tools4,9,10,11,12,13,14.
Studies carried out by researchers in various parts of the world have revealed the importance of bone industry in the processing of animal carcasses and the removal of materials such as meat, tubers and termites, demonstrating the importance and effectiveness of bone tools in very ancient contexts15,16,17.
The use of bones for tool-making demonstrates the high cognitive abilities of hominins, who were able to distinguish the properties of raw materials and their potential applications.
During the middle Pleistocene, bone tools gained prominence, as evidenced by artefacts found at sites such as Marathousa (Greece), I and Schöningen (Spear Horizon) (Germany)18,19.
Bone flakes resulting from marrow extraction differ from the bone flakes of other large animals, such as elephants. It appears that hominins intentionally produced large bone flakes to realise the production of bone tools, including bifaces10.
While bone retouching and specific punctual bone industries are documented in the European Middle Palaeolithic, little evidence exists for the earliest periods, particularly towards the end of the Middle Pleistocene20. In Italy, evidence of bone artefacts crafted from large bone fragments is evidenced in the Lower Palaeolithic, particularly between MIS 13 and MIS 9, a key period recording the onset of Neanderthal activity4,21,22.
Here, we present the first description of bone tools acquired from three archaeological localities in the Frosinone-Ceprano (southern Latium) basin. Use-wear analysis was employed investigate the use of these tools. These sites are Isoletta, Colle Avarone, and Selvotta, and the material is stored in the Pofi Museum.
Identification of the specific use of these bones allowed us to emphasise the concept of human–large animal interaction and, in particular, to highlight the importance that these early bone tools had for the success of precise activities essential to the life of Lower Palaeolithic hominins.
The archeological sites of Isoletta, Colle Avarone and Selvotta
The sites are located in the lacustrine formations of the Frosinone-Ceprano basin. Similar stratigraphic contexts were evidenced by I. Biddittu in 1974 on the Campogrande, Colle Avarone and Selvotta outcrops, which are mainly composed of gravels, sands and sandy clays.
Due to the numerous geochronological data obtained through the 40Ar/39Ar method on volcanic minerals and the ESR/U series, it was possible to chronologically frame these lower Palaeolithic sites, dating them between 410 and 430 ka23.
Isoletta
The archaeological site of Isoletta, which was discovered in 1970, is located a few kilometres SE of Ceprano city at the confluence of the Sacco and Liri Rivers. The stratigraphic sequence of the Isoletta site is characterised by alluvial deposits consisting of sand, gravel, and volcanic material23.
A survey carried out in 1998–99 during the construction of the high-speed railway revealed two archaeological levels at the site: the lower level, where rare lithic industry archaeological material from the Mode 1 industry was found, along with large mammals (elephants), birds, amphibians, and fish remains. An elephant tibia intentionally fractured by humans was found at this level24,25; the upper level (GA6Z) Acheulean industry in flint and limestone included bifaces, choppers, scrapers and denticulates23,24. The faunal remains included large animals such as Elephas antiquus, Bos primigenius, Cervus elaphus, and Dama clactoniana. Palaeontological remains found at level 4 are associated with the Galerian large mammal assemblage26,27.
Colle Avarone
Colle Avarone was identified in 1973 by I. Biddittu. The site, identified in a former “pozzolana” quarry, is located in the lower Sacco River Valley a few kilometres from the confluence of the river with the Liri River. According to an assay carried out by I. Biddittu in 1975, an artefact of bone made from an elephant rib was found23.
In the main archaeological level, tools consisting of the Acheulean industry on bone, flint and limestone were found in fluvio-lacustrine deposits consisting of gravels and volcanic products. The artefacts include mainly bifaces and other artefacts, including flakes28.
The faunal assemblage consists mostly of large mammals (Palaeoloxodon antiquus, Sus scrofa, Equus caballus, Bos primigenius, Cervus elaphus), birds Stercorarius longicaudatus, Anser brachyrhycus) and turtles (Testudo sp.).
Selvotta
The site, the data for which are still unpublished, is located near Colle Avarone. Both lithic and bone tools were recovered at this site. Italo Biddittu proposed a geological correlation between the archaeological level of Selvotta and the archaeological level of Colle Avarone (CA) and the archaeological levels CG 9 and CG 10 above the Campogrande localities. A single archaeological level was found, and most of the lithic and bone remains consist of surface collections. Among the finds, both lithic and bone artefacts were found. All these levels are characteristic fluvio-lacustrine deposits, with gravels and volcanic minerals, of the Lirino palaeolake that formed during the MIS 11/MIS 10 transition period29,30.
Selected item and state of preservation
A total of 32 bone items were analysed: 23 from the Isoletta site (Frosinone), eight from Colle Avarone (Ceprano, Frosinone), and one from Selvotta Selvotta (Ceprano, Frosinone) (Supplementary Figs. 1–7).
Despite localised concretions and slight surface abrasions caused by a few random striations (Supplementary Fig. 8), the bones were exceptionally well preserved, which was confirmed through use-wear analysis.
Furthermore, the good state of preservation of these bone products and the very low degree of fragmentation led us to investigate possible use-related wear at the macro, meso- and microscales.
The selected bone tools were all unretouched except for two, one from the Isoletta and one from the Colle Avarone site. The tools mostly present a morphology with a pointed end used as the active area of the item, but by a smaller number of tools have an active edge localised in the mesial portion of the item.
The experiments
A series of experiments were conducted to characterise the use and wear of replicas of bone fragments, which is pivotal for interpreting the analysed archaeological traces.
The experiments were carried out by five people who had experience in these activities.
The first phase of experimentation consisted of making bone tools that were similar to the archaeological tools. Bovine bones, including the scapula, femur and ribs, were used. These bones underwent fracture via anvil percussion (Fig. 1A–F), followed by cleansing using three flint flakes with a fine-grained texture and two bone fragments (Fig. 1G–L) and were left to dry under ash.
The activities conducted included wood working (debarking), butchering, and soil excavation.
A distinct potentially functional area was identified on each tool for the intended activity, including sharp and straight edges. The active edge remained unmodified by retouch.
Butchering was performed over 2 hours. The first step involved separating the legs of sheep from an adult sheep carcass (Fig. 2A,B) and subsequently removing the meat portion from the rib (Fig. 2C,D). The tool, possessing a pointed end, made it possible to carry out an incision and subsequently make the cut very quickly; the tendons and ligaments required more force and time.
Soil and wood experiments were easily carried out and were performed in one hour. Flatter and straight-edged bones, such as the scapula (for soil digging) and ribs (for debarking wood), were used for these activities (Fig. 2E,F).
During this experiment, it was observed that the tool edge tended to quickly round and lose its effectiveness, likely due to the friction generated by the processed material, which caused dulling of the active edge.
In the process of debarking wood, the mesial portion of the tool was identified as the active edge, as it exhibited better adherence to the surface being processed (Fig. 2F).
Use-wear analysis
Use-wear analysis carried out on the experimental bone fragments showed similarities with the traces found on the archaeological sample, particularly in experiments involving butchering and digging activities.
In relation to butchering activity, Fig. 3 shows analogies between the experimental and archaeologically active edges. Microscopic analysis of the tool revealed overall rounding on the active edge employed for meat removal from the animal carcass.
Polishes were evident along the rounded edge of the tool, characterised by a smooth texture (Fig. 3A) similar to that of the archaeological active edge (Fig. 3B–D) and longitudinally shallow striae distributed longitudinally along the active edge that showed rounding (Fig. 3F–H). SEM analysis highlighted alternating degrees of rounding between poorly developed areas and areas with more pronounced rounding (Fig. 3F). Pronounced rounding correlated with an incision made into fattest area of carcasses, such as the epidermis. As hypothesised for the archaeological sample (Fig. 3D), the tool’s adherence to the fattier meat sections led to increased rounding of the striae. Conversely, softer and less fatty internal carcass areas resulted in moderate rounding.
A comparison of use-wear on the archaeological and experimental tools suggested that the majority of the analysed tools were employed in butchering activities. Furthermore, similarities were observed in the tools used in the soil excavation experiments (Fig. 4).
The use-wear analysis of the soil excavation tools revealed pronounced rounding of the active edge, exceeding the rounding observed in the tools used for butchering (Fig. 5). The difference from meat processing was accentuated by the formation of deeper striae (Fig. 5C,D), attributable to the intense friction and granular nature of the soil, which consistently worn down the tool.
Microscopic analysis revealed the presence of polishes characterised by a rough-to-smooth texture, typical of contact with a resistant material such as soil, that showed strong similarities with the polishes of sample items #13027, #4169, and #8755 (Fig. 4B–D). SEM analysis revealed substantial rounding of the striae, confirming, through comparison with archaeological findings, the hypotheses regarding this type of activity (Fig. 4E,F).
Results
General considerations for sample and bone tool functions
Each analysed item was classified based on its morphological characteristics. These parameters (see Table 1) combined with the reference collection data enabled the interpretation of the use of these items.
The following wear categories were established: edges with rounding resulting from bone versus unused edges; tool-generated structures versus natural bone structures; and use-related wear versus wear caused by post-depositional factors (Fig. 6).
This classification is established in the literature. Abrasion is caused by mineral particles carried by water and wind.
Unlike human-induced abrasion, general abrasion is not localised but spreads across the whole bone surface. The natural rounding of edges due to abrasion was distinguished from edges polished through human sharpening with abrasive materials31,32,33.
Bone modifications by hominins can arise from activities such as butchering and disarticulation34, resulting in the formation of striae (cutmarks, scrapemarks). These exhibit specific characteristics: striae from human activities are noted for being parallel, closely spaced, and narrow with short lines on bones.
Upon examination of the analysed sample, it was observed that some polishes and striae were concentrated at specific points, while others extended across the entire bone surface. The close, parallel, linear, and narrow striae were closely associated with the rounded edges. These differed from natural bone striae, which are generally more superficial and run along the entire bone surface.
For the Isoletta site, out of the 23 items examined, edge rounding, polishes and striae were observed on 18 items, while four items (four out of 23 items) showed only edge rounding. The traces on one item (one out of 23 items) were uninterpretable.
In the case of Colle Avarone, six out of seven items showed use-wear, while the use for one item was not interpretable (one out of seven items). At the Selvotta site, use-wear was analysed for only one item.
All the items show a recurrence in the morphological features and distribution of the diagnosed traces.
In general, bone fragments are characterised by very pronounced rounding of the distal, pointed edge of the tool (Supplementary Fig. S9), while in rare cases, rounding is present in the mesial portion of the active edge.
A specific example is the tool (#8618) from the Colle Avarone site. This tool exhibited considerable rounding of the active edge and revealed negative detachment resulting from tool retouching before activity (Supplementary Fig. S10). Further examination of these roundings was conducted using a metallographic microscope, digital microscope (Hirox) and scanning electron microscope (SEM), which confirmed the presence of striae and polishes.
Striae and Polishes on the bone tools
The striae were distinguished based on their depth (shallow and deep), shape (straight and sinuous) and orientation (perpendicular or longitudinal to the active edge).
Their location was a crucial factor in interpreting use-wear, which involved three identified parameters: striae present on the outer edge, striae distant from the active edge, and the distribution of traces consistent with the direction of use.
Microscopic analysis also revealed a chaotic distribution of striae on the item surfaces. This distribution is associated with post-depositional events, e.g., ground particles might have caused abrasion, resulting in scratching on the bone surface (Supplementary Fig. S11).
SEM analysis highlighted the degree of rounding of the striae, which tended to be shallow in most cases, indicating potential processing of a low-resistance material.
Associated with these striae, microscopic analysis revealed the presence of low-shinning polishes, referred to as “matts,” mostly developed along the active edge or slightly shifted towards the surface. These polishes show a continuous trend from a rough to a smooth texture.
Concerning the Isoletta site, item #4245 shows a combination of striae, polishes and rounding at its edge. Numerous shallow striae scratching the polishes developed on the active edge with longitudinal and perpendicular orientations. The observed smooth texture of the polishes suggested the processing of a soft material. Detailed morphological analysis through SEM at high magnification revealed roundings on the striae, further supporting this interpretation (Supplementary Fig. S12).
Comparative analysis with the experimental traces allowed us to hypothesise that this tool was used to process materials of soft consistency, such as hides that required mixed modes of motion. Friction generated during contact between the tool and the material being processed likely caused the rounding of the striae. Item #4010, which displayed shallow longitudinal striae and associated smooth-textured polishes, indicated the processing of softer material (Supplementary Fig. S11).
SEM analysis revealed less pronounced rounding of the striae in this sample than of the other bone fragments, suggesting less friction, likely due to contact with a softer material, such as meat.
For item #13027, the rounding was located in the distal portion of the fragment, which is characterised by a pointed shape. Microscopic observation revealed rounded active edges with perpendicular striae exhibiting significant rounding, accompanied by polishes displaying a rough-to-smooth texture (Supplementary Fig. S13).
This type of trace allowed us to hypothesise that the tool was used for the processing of stronger material, such as soil, that generated more friction on the surface of the item, as evidenced by the degree and extent of rounding of the pointed area.
Similar traces were noted on bone items found at the Colle Avarone. Item #8618 shows highly localised and developed rounding of the active edge. Additionally, the edge displays small detachments overlapped with larger detachments, indicating knapping activity aimed at shaping the tool before use (Supplementary Fig. S10).
Microscopic analysis revealed polishes with a smooth texture, longitudinal orientation and shallow unidirectional striae, confirming the use of the item in the cutting of soft material.
Similar use-wear patterns were also identified at the Selvotta site. Bone fragment #10119 shows shallow striae with a transverse orientation characterised by pronounced rounding (Supplementary Fig. S14). The presence of these features, together with polishes with rough-to-smooth texture, suggests contact with a material that, while not highly resistant, generated enough friction to cause substantial rounding. Therefore, this fragment was likely used for processing soft materials, such as hides.
Discussion
The use-wear analyses carried out on the Isoletta, Colle Avarone, and Selvotta sites demonstrated the involvement of bone tools in both butchering activities and ground excavation.
The polishes and the depth of the striae served as crucial parameters for distinguishing between the different types of materials processed.
Due to the polishing, it was possible to distinguish between soft materials and hard materials. However, the depth of the striae allowed for discerning the degree of abrasion caused by the processed material. In fact, as the table shows, softer materials such as meat tend to generate shallow striae on the tool, while tools exhibiting deeper striae are likely to be used for processing stronger materials (Tables 1 and 2).
The degree of rounding of these striae was an important factor in interpreting the use of the artefacts, notably in hiding and soil processing. Experimentation highlighted a difference in the rounding of the striae generated by meat and hide processing. Striae were less rounded in tools used for meat processing due to the lower fat content of the material, while hide processing resulted in more rounded striae. This discrepancy may be attributed to the viscosity of hide, which causes more friction against the tool.
The presence of microtraces and the depth of the striae were equally significant in distinguishing tools used for hide processing from those used for soil working. As illustrated in the summary table (Table 2), the rounding of the striae appears identical in both cases, as extreme rounding of the active edge was generated by friction with the worked material.
However, the disparity between the two types of material is evident in the nature of the polishes and the depth of the striae. In hide processing, the striae tend to be shallow, with the polishes exhibiting a smooth texture. In contrast, soil processing yields deeper striae with rough-to-smooth textured polishing. This distinction arises from differences in friction and the textures of the processed material. Soft and more viscous materials are generally less granular than materials such as soil, which contain numerous inclusions such as gravel, sand and plant residues.
Analysis of the items from the three Southern Latium (Italy) sites indicated that not all tools showed signs of intentional knapping. In fact, some tools have no signs of shaping by knapping. The edge was considered to be effective immediately after detachment from the bones. This hypothesis was confirmed through experimental data, suggesting that in certain cases, the active edge of bone tools remained unmodified, retaining sharpness from their initial use.
The pointed area of the bone used for making initial incisions appears to be a sought-after tool region, and the experimental data validated its effectiveness.
This is the first demonstration of use-wear on bone items from late lower Palaeolithic sites. Both unshaped and shaped bones were effectively used as tools. Fragments of bones, likely byproducts from marrow exploitation, were possibly utilised as a tool if they possessed a sharp and pointed morphology. Moreover, bones were knapped and retouched to produce the desired morphologies to accomplish different tasks.
These data indicate the presence of bone fragments, bone flakes and retouched bones from late lower Palaeolithic sites onwards. These items are sparsely distributed in these sites, suggesting that they were present not due to occasional use or intentional production but due to the primary role of these items in the toolkit, which we attribute to the lithic industry18,35,36and reference there in.
A study conducted on bone fragments from Isoletta, Colle Avarone and Selvotta (Latium, Italy) demonstrated the ability of hominins to use land and exploit resources during the MIS 11/10 period. The ability to exploit animal carcasses not only as a food source but also in crafting tools reflects the high behavioural flexibility of humans, who exhibited the capacity to interact not only within their social group but also with the broader environment, demonstrating behaviours that indicate significant cognitive development.
The study underscored the remarkable potential of bone tools, particularly in the pointed active edge portions, enabling precise actions such as butchering animal carcasses by making incisions with the tip and cutting meat with the rest of the active edge. At the same time, as demonstrated by experiments, these sharp edges were useful for soil excavation, potentially for gathering nutrients such as tubers or for capturing insects and small animals.
These bone tools provide new evidence of the technological shift recorded for human populations living in Western Europe after the long and strong glacial event MIS 12 and during the long interglacial MIS 11. They also raise questions about the diversity of activities of the human groups living in southern Europe and possible relationships with more favourable climatic conditions that allowed for the acquisition of diverse food resources (ground and soil resources).
This article provides insight into the potential of bone tools recovered from a series of sites situated in central Italy, a region rich in late lower Palaeolithic sites. The presented data confirm that these ancient human groups used an integrated tool kit of lithic and bone tools to guarantee broad exploitation of the environment they encountered. This finding is reinforced by the discovery of bone tools in Asia in Lower and Middle Palaeolithic sites in addition to the tools found in European regions37 and reference there in.
Materials and methods
Use-wear analysis was conducted on a sample of 32 bone items sourced from various portions of long and flat bones found across three sites in southern Lazio. From the Isoletta (Fr) sites, 23 of the 735 items were chosen, while eight of the 640 items were selected from the Colle Avarone (Fr) site, and only one of the 105 items was selected from the Selvotta (Fr) site.
Selection criteria were based on the observable potential of the items, which was evident to the naked eye. We selected items that exhibited a good state of preservation and morphological features indicating potential use (see below). The terms “shaped” and “nonshaped” were used in this article to distinguish between intentionally modified and unmodified tools, respectively.
The analyses were carried out at the Laboratory of Technological and Functional Analyses of Prehistoric Artefacts (LTFAPA) of Sapienza University of Rome.
Various areas on each tool, especially the rounded active edges, were identified. Unfortunately, no evidence of microresidues was found on the surface of the analysed tools.
Prior to analysis, the samples were observed under a stereomicroscope to assess their state of preservation. They were subsequently cleaned with deionised water and neutral Derquim at 2% to remove any surface particles and hand grease that accumulated over time from handling. Each item was then left to air-dry on absorbent paper.
Use-wear analysis involved a low magnification approach (LPA)38,39,40 with a Nikon SMZ-745 stereomicroscope (with 10 × binocular stereomicroscope eyepieces and 1 × objective, magnification ranging between 0. 67 × and 5 × , and a reflected light illumination system) that allowed, through magnifications between 2 and 3 × , identification of the distribution of the traces and the degree of rounding of the active edges. Additionally, a high magnification approach (HPA)40,41, was employed with an Optiphot and Nikon Eclipse microscope (with reflected light illumination and 15 × and 10 × eyepieces, 10 × and 20 × lenses and digital ToupCam cameras), which allowed for the identification of the striae and polishes present on the active edges.
Further analysis was conducted using a digital microscope (Hirox RH-2000) with magnifications exceeding 150X and a scanning electron microscope (SEM) (Hitachi TM-3000) to examine the polish texture and stria depth. The analysed samples were subjected to a total vacuum at a voltage of 15 V in analy mode.
Due to the large size of the specimens, a mould of the edge was made using low-grip two-component silicon (Vestige Light Fast) to facilitate insertion under the microscope or into the SEM vacuum room. This process was aimed at preventing surface bone particle detachment. Next, a cast of the mould was made with an epossyc resin (with proportion of Araldite LY554 40% and hardener HY956 10%); the cast was coated with a gold film for SEM analysis.
For the interpretation of use-wear and evaluation of striae—which was not solely based on literature reports—the reference collection available at the LTFAPA laboratory was used, which was supplemented by a dedicated series of experiments involving replicas of bone tools used on materials with different consistencies. Our experiments were conducted on fresh bones of cattle purchased from a butcher shop in Italy that was legally authorised by Italian law to market the meat and bones of cattle from authorised slaughterhouses in compliance with European regulations.
Data availability
All data generated or analysed during this study are included in this published article [and its supplementary information files].
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Acknowledgements
We thank you to “Soprintendenza archeologica, belle arti e paesaggio per le provincie di Frosinone” e Latina, for granting permission for the study of Italian bone industries. We thank you the fundings of the Neandroots project (n° of the Grant: ANR-19-CE27-0011-01).
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F.M. and C.L. designed the research; F.M. conducted the use-wear analysis on the experimental and archaeological materials, conceived, designed and performed the experiment; C.L. contribute to the the discussion and interpretation of the archaeological material; M.H.M. contribute to the discussion of the archaeological material and research financing through the Neandroots project; F.M, C.L. and M.H.M. wrote the paper. All the author reviewed the manuscript.
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Marinelli, F., Moncel, MH. & Lemorini, C. The use of bones as tools in Late Lower Paleolithic of Central Italy. Sci Rep 14, 11666 (2024). https://doi.org/10.1038/s41598-024-62612-z
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DOI: https://doi.org/10.1038/s41598-024-62612-z
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