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The first Upper Triassic silicified hypercalcified sponges from the Alexander Terrane, Gravina Island and Keku Strait, southeast Alaska

Baba Senowbari-Daryan, Andrew H. Caruthers and George D. Stanley
The first Upper Triassic silicified hypercalcified sponges from the Alexander Terrane, Gravina Island and Keku Strait, southeast Alaska
Journal of Paleontology (March 2008) 82 (2): 344-350

Abstract

This paper describes the first silicified Upper Triassic (Early Norian) hypercalcified sponges known from the Alexander terrane, southeast Alaska. Sponges consist of five taxa from the Cornwallis Limestone of Keku Strait, southeast Alaska: Amblysiphonella Steinmann, Parauvanella Senowbari-Daryan and Di Stefano, Nevadathalamia cylindrica (Seilacher), N. minima n. sp., and Stellispongia (S. cf. subsphaerica Dieci, Antonacci, and Zardini). The hypercalcified sponges of the Alexander terrane as described in this paper provide paleogeographic linkage with other far-flung terranes of western North America, namely the Western Great Basin of Nevada, Stikinia of the Yukon, as well as the Antimonio terrane of northwestern Mexico. In addition, Parauvanella cf. ferdowensis is known from the Upper Triassic Nayband Formation, Iran. Finally Stellispongia cf. subsphaerica is known from the Upper Carnian Cassian Formation of the Dolomite Alps. Sponges (particularly hypercalcified inozoans, sphinctozoans, chaetetids, and sponge-like organisms) are known worldwide from many Upper Triassic reef and nonreef sites. Although Upper Triassic deposits within the Cordilleran terranes and cratonal North America do not typically contain reeflike buildups, hypercalcifying sponge-like organisms were noted as occurring as part of the intricate paleoecological structure within a biostrome along the western shoreline of Gravina Island, southeast Alaska (southern Alexander terrane). This is in contrast to Keku Strait, southeast Alaska (central Alexander terrane), where hypercalcified sponges were identified from limestone beds within nonreef deposits.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 82
Serial Issue: 2
Title: The first Upper Triassic silicified hypercalcified sponges from the Alexander Terrane, Gravina Island and Keku Strait, southeast Alaska
Affiliation: Friedrich-Alexander-Universitaet Erlangen, Institut fuer Palaeontologie, Erlangen, Federal Republic of Germany
Pages: 344-350
Published: 200803
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 71
Accession Number: 2008-072132
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N56°52'60" - N56°52'60", W133°55'60" - W133°55'60"
N55°15'00" - N55°15'00", W131°45'00" - W131°45'00"
Secondary Affiliation: University of Montana, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200819
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