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

Figure 4

Chondrite-normalized REE patterns of the concretions and surrounding rocks in the Xiamaling Formation. SC-BS and SC-GC mean the silicified concretions in the black shales and green cherts, respectively. The contents of REEs of chondrite were referenced from [25].