Table 2 Results of C content and δ13CvsPDB analysis of examined concretions.

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

  C (wt%) δ13CvsPDB(‰)
Teshio 1 Concretion 4.79 −21.9
2 5.38 −20.1
3 4.45 −16.1
4 6.61 −16.1
5 4.47 −15.6
6 matrix 1.56 −11.3
7 0.03 −11.2
Yatsuo 1 Concretion 7.20 −19.2
2 7.87 −19.1
3 8.36 −18.3
4 6.07 −15.9
5 7.54 −18.7
6 8.86 −19.0
7 6.20 −17.6
8 matrix 0.01 −6.4
9 0.01 −7.6
10 0.01 −8.3
Morozaki 1 Concretion 6.61 −16.1
2 0.03 −11.2
3 8.56 −7.3
4 matrix 8.58 −1.2
5 7.29 3.1
6 0.06 0.03