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Age of the hexactinellid beds of the Roberts Mountains Formation, Snake Mountains, Nevada, and additions to the Silurian sponge fauna

Published online by Cambridge University Press:  14 July 2015

J. Keith Rigby  and
Brian J. Maher
J. Keith Rigby
Affiliation:
Department of Geology, Brigham Young University, Provo, Utah 84602, and
Brian J. Maher
Affiliation:
ASARCO Inc., 510 East Plumb Lane, Reno, Nevada 89502
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Abstract

The graptolite, Bohemicograptus bohemicus tenuis (Bouček, 1936), was collected with additional hexactinellid sponges from the Roberts Mountains Formation in the Snake Mountains of Elko County, Nevada, and dates the sponge beds as Ludlovian. To the modest fauna of hexactinellid sponges described by Rigby et al. (1991), can be added the new sponge genera and species Divaricospongia dilata and Fistellaspongia inclinata. The new species, Gabelia intermedia, is intermediate in size between the moderately fine-textured Gabelia pedunculus Rigby and Murphy, 1983, and the large Gabelia giganta Rigby et al. 1991. Additional specimens of Gabelia pedunculus were collected in association with well-preserved specimens of Gabelia fasiculata Rigby et al. 1991, which show additional skeletal and canal details. Associated coarse root tufts and patches of protosponge skeletal mesh were also discovered as part of the new collections and are described here, although not generically nor specifically identifiable.

Type
Research Article
Information
Journal of Paleontology , Volume 69 , Issue 6 , November 1995 , pp. 1020 - 1029
Copyright
Copyright © The Paleontological Society 

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