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The paleoecology of Mississippian corals in the western conterminous United States

100%

Sando W. J.

Acta Palaeontologica Polonica

1980

tom 25

nr 3-4

In the Mississippian (Early Carboniferous) of the Rocky Mountain and Great Basin regions of the United States, colonial Rugosa occur exclusively in shallow-water lithofacies. Tabulates occur in both deep- and shallow-water lithofacies. Among the solitary Rugosa, which occur in both deep- and shallow-water lithofacies, deep-water forms are predominantly nondissepimented. Most taxa that occur in both deep- and shallow-water lithofacies first appeared in deep water, then migrated to shallow water later in geologic time. Corals lived predominantly in deep water during Kinderhookian (early and middle Tournaisian) time, despite the existence of large areas of shallow-water deposition. A marked shift in coral occurrence to predominantly shallow-water environments took place in latest Kinderhookian (middle Tournaisian) time, and this trend toward shallow-water continued to the end of the Mississippian (early Namurian).

Morphogenesis and relationships of Trochophyllum Milne - Edwards and Haime, 1850 (Coelenterata, Anthozoa)

63%

Fedorowski J., Sando W. J.

Acta Palaeontologica Polonica

1989

tom 34

nr 1

Detailed study of the holotype and topotypes of the type species of Trochophyllum Milne-Edwards and Haime reveals that this genus has a unique Internal morphology most similar to Neaxon Kullman. Although the systematic relationships of small, aulate solitary corals remain dubious, Trochophyllum is referred provisionally to the family Petraiidae de Koninck. The genus is represented by the type species, T. verneuilanum Milne-Edwards and Haime, and the informal taxon T. sp. 1, which ’are known only from Tournaisian (early Osagean) strata in Kentucky and Indiana, USA. Previously published records of Trochophyllum outside the type locality of its type species are either invalid or unconfirmable on present published information. Trochophyllum is distinguished by a highly variable aulos that is typically of the stereotheca-type, filled with stereoplasm at maturity; axial tabulae absent or not preserved at maturity; cardinal septum shortened in the calice; and minor septa developed only as foundations.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Sando W. J.

1 Fedorowski J.

1 1989

1 1980

Wyniki wyszukiwania

The paleoecology of Mississippian corals in the western conterminous United States

Morphogenesis and relationships of Trochophyllum Milne - Edwards and Haime, 1850 (Coelenterata, Anthozoa)