Graptolites from the Wheeler and Marjum Formations (Cambrian, Series 3) of Utah

Specimens from the Wheeler and Marjum Formations of Utah comprising an elongate stipe with freely projecting conical thecae are described as dithecoid graptolites, the first reported from these units. The Wheeler Shale specimens, assigned to Archaeolafoea monegettae (Chapman, 1919), provide the firs...

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Bibliographic Details
Published in:Journal of paleontology 2014-03, Vol.88 (2), p.403-410
Main Authors: LoDuca, Steven T, Kramer, Anthony
Format: Article
Language:English
Subjects:
Algae
Archaeolafoea monegettae
Cambrian
Colleges & universities
Drum Mountains
Graptolithina
Hemichordata
House Range
Invertebrata
invertebrate
Laurentia
Marjum Formation
Mastigograptus
Middle Cambrian
Millard County Utah
morphology
Ordovician
paleoecology
Paleontology
Paleozoic
Pterobranchia
SEM data
Stratigraphy
taphonomy
Taxonomy
United States
Utah
Wheeler Formation
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Description
Summary:Specimens from the Wheeler and Marjum Formations of Utah comprising an elongate stipe with freely projecting conical thecae are described as dithecoid graptolites, the first reported from these units. The Wheeler Shale specimens, assigned to Archaeolafoea monegettae (Chapman, 1919), provide the first record of Archaeolafoea Chapman, 1919 from the Cambrian of Laurentia and show clear fusellar structure in backscattered electron images, confirming a graptolite affinity for this taxon. Mastigograptus sp., described on the basis of a single well-preserved specimen from the Marjum Formation, shows for the first time in a Cambrian mastigograptid an arrangement of thecae similar to that known for Ordovician representatives of the genus.
ISSN:0022-3360
1937-2337
DOI:10.1666/12-096