Vase-shaped microfossils from the neoproterozoic Chuar Group, Grand Canyon: A classification guided by modern testate amoebae

From: Journal of Paleontology | Date: May 1, 2003| Author: Knoll, Andrew H; Meisterfeld, Ralf; Porter, Susannah M | Copyright information

ABSTRACT-Vase-shaped microfossil (VSM) assemblages from early diagenetic carbonate nodules in >742 + or - 6 Ma black shales of the Chuar Group, Grand Canyon, provide evidence for affinities with testate amoebae. Not only are VSMs exceptionally preserved in Chuar rocks, they exhibit a much higher degree of morphological diversity than was previously known. Using the taxonomy of modern testate amoebae as a guide, nine new species and eight new genera of VSMs are described, augmenting the eig...

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