Remarkable Preservation of Microfossils and Biofilms in Mesoproterozoic Silicified Bitumen Concretions from Northern China

Table 2

The group components of the internal materials in the concretions. The sample numbers were same as those in Table 1 and Figure 4.

	Saturates (wt%)	Aromatics (wt%)	Resins (wt%)	Asphaltenes (wt%)
SC-BS-1	2.56	5.48	2.21	89.75
SC-BS-2	1.24	5.73	3.60	88.43
SC-GC-1	2.21	4.71	2.85	90.23
SC-GC-2	1.85	6.48	3.72	87.95