Proof for the synsedimentary biota in Pre-Cambrian shales

P.K. Maithy; H.D. Pflug

doi:10.54991/jop.1981.1391

Authors

P.K. Maithy Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India
H.D. Pflug Geologisch-Palaöntologische Institut, der Justus Liebig Universität, D-63, Giessen, Germany

DOI:

https://doi.org/10.54991/jop.1981.1391

Keywords:

Optical techniques, Synsedimentary biota, Pre-Cambrian shales, India

Abstract

Three optical techniques are described to differentiate synsedimentary biota from contaminants and artifacts in Pre-Cambrian shales. These techniques are (a) study of polished rock surface in a dark field in incident light illumination and with the heating on stage microscope in fluorescence light, (b) study of thin sections in interference contrast, and (c) examination of macerated and isolated specimens in Zernike phase-contrast and in interference contrast. Two young Pre-Cambrian shales, one from the Vindhyan Supergroup of India and the other from the Bushimay Group of Zäire have been examined by these techniques. The results demonstrate that both the shale samples contain biota of the synsedimentary deposits.

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