Nacre in an early gryphaeid bivalve (Mollusca)

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 calcit...

Full description

Saved in:
Bibliographic Details
Published in:Journal of paleontology 1994-11, Vol.68 (6), p.1405-1408
Main Authors: McRoberts, Christopher A., Carter, Joseph G.
Format: Article
Language:English
Subjects:
Acetates
Biology
Calcite
Evolution
Geology
Gryphaea
Human ecology
Marine
Marine ecology
Mollusks
Norian age
Paleontological Notes
Paleontology
Peels
Triassic
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0022-3360
1937-2337
DOI:10.1017/S0022336000034387