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Triassic sponges sphinctozoa from hells canyon oregon usa






Journal of Paleontology 62(3): 419-423

Triassic sponges sphinctozoa from hells canyon oregon usa

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 dispalced 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.


Accession: 006840769

DOI: 10.2307/1305417



Related references

Senowbari-Daryan, B.; Stanley, G.D., : Jr, 1988: Triassic sponges Sphinctozoa from Hells Canyon, Oregon. 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 , known from the Tethys region, and Colospongia whal...

Anonymous, 2006: Hells Canyon National Recreation Area and Hells Canyon Wilderness, Idaho and Oregon

Stanley G.D.Jr; Whalen M.T., 1989: Triassic corals and spongiomorphs from hells canyon wallowa terrane oregon usa. Twenty-one species of corals and three species of spongiomorphs occur in a series of richly fossiliferous, molluscan-dominated beds with silicified bioclasts in the Upper Triassic Martin Bridge Limestone of Hells Canyon, Oregon. Two of these, Maea...

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Newton, Cr, 1986: Late Triassic bivalves of the Martin Bridge Limestone, Hells Canyon, Oregon: taphonomy, paleoecology and paleozoogeography. U S Geological Survey Professional Paper: 7-21 (1435)

Newton Cathryn R., 1986: Late Triassic bivalves of the Martin Bridge Limestone, Hells Canyon, Oregon; taphonomy, paleoecology, paleozoogeography. U S

Grams Paul E., 1991: Degradation of alluvial sand deposits along the Snake River below Hells Canyon Dam, Hells Canyon National Recreation Area, Idaho. The Green Mountain Geologist 17(4): 5

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Simmons George C.; Close Terry J., 1984: Hells Canyon Study Area, Oregon and Idaho. U S

Senowbari-Daryan, B.; Reid, RP., 1987: Upper Triassic sponges (Sphinctozoa) from southern Yukon, Stikinia Terrane. Canadian Journal of Earth Sciences, 245: 882-902