Figure 2: | Scientific Reports

Figure 2

From: Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis

Figure 2

Sampling locations and the characteristics in hand specimen of studied Japanese spherical carbonate concretions. (A) Teshio concretions (L1); (B) Yatsuo tusk-shell concretions (L2), and (C) Morozaki ‘ghost-shrimp’ concretions (L3). Teshio concretions from Hokkaido with rounded impressions in their centers suggesting the presence of a non-skeletal animal (arrows: A1). δ13C data also suggest an organic carbon origin. (D) X-ray diffractograms for each concretion shows a clear calcite peak. Index map is based on the data of Geospatial Information Authority of Japan website (http://www.gsi.go.jp/maps.gsi.go.jp). All photographs (AC) shown here are taken by H.Yoshida.