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Two new genera of Upper Silurian actinostromatid stromatoporoids

Published online by Cambridge University Press:  20 May 2016

Carl W. Stock  and
Judith A. Burry-Stock
Carl W. Stock
Affiliation:
Department of Geology, The University of Alabama, Tuscaloosa 35487-0338
Judith A. Burry-Stock
Affiliation:
Program in Educational Research, The University of Alabama, Tuscaloosa 35487-0231
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Abstract

Two new genera of Upper Silurian stromatoporoids in order Actinostromatida are described. Genus Bicolumnostratum Stock, with type species B. micum (Bogoyavlenskaya), is characterized by two kinds of pillars and nonaligned colliculi, and is assigned to family Actinostromatidae. Genus Acosmostroma Stock, with type species A. ataxium Stock new species, contains irregular micropillars and microcolliculi, and is assigned to family Densastromatidae. Two additional new species are Acosmostroma glascoense Stock and A.? cobleskillense Stock. A fourth species is A. tenuissimum (Parks). Bicolumnostratum is known from Ludlow- and Pridoli-age strata, whereas the occurrences of Acosmostroma are strictly Pridoli in age.

Type
Research Article
Information
Journal of Paleontology , Volume 72 , Issue 2 , March 1998 , pp. 190 - 201
Copyright
Copyright © The Paleontological Society 

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