Carbon isotope signatures of Neoproterozoic and Early Cambrian organic fossils from Siberian and East European platforms

Study of carbon isotopic composition of micro- and macrofossils and dissipated sedimentary matter (kerogens) extracted by acid maceration from the clay shales from three Riphean, Vendian, and Cambrian sections of the Siberian and East European platforms revealed identical δ13Corg values for fossils from the same sample. Such similarity of carbon isotope signatures in the remains of various organisms (algae, animals, microbial mats) could be caused by the similar way of carbon isotope fractionation by marine and continental organisms in the late Precambrian and Early Cambrian.