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1 2005

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Micropalaeontological studies in Lower Cambrian rocks of the Yangtze Plate, China : methods and results

Braun A., Chen Y., Waloszek D., Maas A.

Studia Geologica Polonica

2005

Vol. 124

11-20

Deep water lowermost Cambrian sedimentary successions, Yangtze Plate, China, contain a variety of organic (acritarchs) and siliceous (sponge spicules, radiolarians) microfossils, representing oceanic both plankton and benthos. Predominant rock types are dark bedded cherts and black shales, with phosphorite concretions and phosphatic limestones. Specific methods used to separate micro- fossils from those rocks include surficial or whole-rock HF and HCl-etching, but also the acetate peel method. The latter method can be successfully applied to siliceous and clay-rich lithologies. Microfossil separation methods are described and their results are shown.