摘要
Molar-tooth carbonates (briefly called MT or microsparite carbonates) are characterized by early diagenetic sedimentary features. The term of ’Molar-tooth’ is named after their tapered, ptygmatically folded texture which are mainly developed in Mesoproterozoic and Neoproterozoic carbonates. The authors investigated the MT carbonates from Simian (0.65~0.81 Ga) of Neoproterozoic Era in Liaoning and Jilin provinces of China. The results show that MT carbonates contain a lot of Prokaryote bacteria, Archaebacteria, Eukaryote algae, Fungi and Protozoa. Therefore, the origin of MT carbonates should be acompanied by these early organisms.