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Triassic sponges (Sphinctozoa) from Hells Canyon, Oregon

Published online by Cambridge University Press:  02 September 2016

Baba Senowbari-Daryan  and
George D. Stanley Jr.
Baba Senowbari-Daryan
Affiliation:
Institute of Paläontology, University of Erlangen–Nürnberg, Loewenichstrasse 28, D-8520 Erlangen, West Germany
George D. Stanley Jr.
Affiliation:
Department of Geology, University of Montana, Missoula 59812
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Abstract

Two Upper Triassic sphinctozoan sponges of the family Sebargasiidae were recovered from silicified residues collected in Hells Canyon, Oregon. These sponges are Amblysiphonella cf. A. steinmanni (Haas), known from the Tethys region, and Colospongia whaleni n. sp., an endemic species. The latter sponge was placed in the superfamily Porata by Seilacher (1962). The presence of well-preserved cribrate plates in this sponge, in addition to pores of the chamber walls, is a unique condition never before reported in any porate sphinctozoans. Aporate counterparts known primarily from the Triassic Alps have similar cribrate plates but lack the pores in the chamber walls. The sponges from Hells Canyon are associated with abundant bivalves and corals of marked Tethyan affinities and come from a displaced terrane known as the Wallowa Terrane. It was a tropical island arc, suspected to have paleogeographic relationships with Wrangellia; however, these sponges have not yet been found in any other Cordilleran terrane.

Type
Research Article
Information
Journal of Paleontology , Volume 62 , Issue 3 , May 1988 , pp. 419 - 423
Copyright
Copyright © The Paleontological Society 

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