Prospective Lithologies, Techniques and Chances for Microscopic Paleontology at the Vendian/Cambrian Boundary

Based on own laboratory experience and a literature review, techniques for processing of different sedimentary lithologies and microscopical investigation in Neoproterozoic-Cambrian sequences are described. Emphasis is placed on etching and sequential sectioning techniques in cherts, phosphorites and limestones, widespread lithologies during this time interval in West Gondwana and elsewhere. Based on the hypothesis that ancestral metazoans in the Late Precambrian are likely to be expected as plankton or meiobenthos preserved in deeper water environments, prospective lithologies and possible paleoenvironments are indicated where future search should be centered.