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Nacre in an early gryphaeid bivalve (Mollusca)

Published online by Cambridge University Press:  20 May 2016

Christopher A. McRoberts  and
Joseph G. Carter
Christopher A. McRoberts
Affiliation:
Department of Geology, Heroy Geology Laboratory, Syracuse University, Syracuse, New York 13244-1070
Joseph G. Carter
Affiliation:
Department of Geology, University of North Carolina at Chapel Hill 27599-3315
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Extract

McRoberts (1992, figs. 4.13, 4.14, 6.8) illustrated the shell microstructure of late Triassic Gryphaea (Gryphaea) arcuataeformis Kiparisova, 1936, and Gryphaea (Gryphaea) nevadensis McRoberts, 1992. McRoberts (1992, p. 33) described the left valve of G. arcuataeformis as showing “neomorphosed calcite with multiple laminae of ?prismatic structure perpendicular to [the] outer shell surface ….” He described the left valve of G. nevadensis as consisting of two distinct layers of neomorphosed calcite:“…an outer layer with ?prismatic structure occasionally with bands of dark material (?micritic matrix), and a much thinner inner layer with ?cross-foliated structure ….” Subsequent study has shown these microstructural diagnoses to be inaccurate. They are revised as follows.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 68 , Issue 6 , November 1994 , pp. 1405 - 1408
Copyright
Copyright © The Paleontological Society 

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References

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