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Silurian pentameroid brachiopods preserved in position of growth

A. M. Ziegler, A. J. Boucot and R. P. Sheldon
Silurian pentameroid brachiopods preserved in position of growth
Journal of Paleontology (1966) 40 (5): 1032-1036


Articulated specimens of Pentamerus oblongus and Stricklandia lens occur in a vertical position, umbones down, in blocks collected from a bed of late Llandovery age [Red Mountain Formation] in Alabama and from the Lower Llandovery of Scotland, respectively. These brachiopods are in their original position of growth, as indicated by growth irregularities in many specimens caused by proximity to their neighbors. Ample attachment surface was available in the form of disarticulated valves which are preserved just beneath the umbones of the specimens; the delthyria of these pentameroids are covered in such a way by the umbones of the brachial valves that it seems likely that their pedicles atrophied during ontogeny.

ISSN: 0022-3360
EISSN: 1937-2337
Serial Title: Journal of Paleontology
Serial Volume: 40
Serial Issue: 5
Title: Silurian pentameroid brachiopods preserved in position of growth
Pages: 1032-1036
Published: 1966
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
Accession Number: 1966-003946
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N30°00'00" - N35°00'00", W88°30'00" - W85°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1966
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