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Bryozoan provinces and patterns of generic evolution and extinction in the Late Ordovician of North America

Anstey, Robert L.

Lethaia, 1986-01, Vol.19 (1), p.33-51 [Periódico revisado por pares]

Oxford, UK: Scandinavian University Press

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  • Título:
    Bryozoan provinces and patterns of generic evolution and extinction in the Late Ordovician of North America
  • Autor: Anstey, Robert L.
  • Assuntos: biomes ; Bryozoa ; complexity ; diversity ; Earth sciences ; Earth, ocean, space ; endemism ; eurytopy ; Exact sciences and technology ; extinction ; Invertebrate paleontology ; North America ; Ordovician ; Paleontology ; provinces ; succession ; survivorship ; tiering
  • É parte de: Lethaia, 1986-01, Vol.19 (1), p.33-51
  • Notas: 10.18261/let
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    ArticleID:LET33
    istex:42D761A73B68488F4497F4D57F464B3BFBF3FD19
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
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    content type line 23
  • Descrição: The Late Ordovician bryozoan genera of central and southeastern North America are geographically distributed in three biotic provinces, separated by boundaries reflecting major lithofacies differences. The central Cincinnati Province contains most of the North American endemic genera, and represents a narrow ecological zone separating the clastic wedges of the marginal Reedsville‐Lorraine Province from the cratonic carbonate platform of the Red River‐Stony Mountain Province. The provinces provided major life zones, or biomes, for each of the five bryozoan orders. Genera comprising the provinces differed as well in morphologic complexity, geochronologic survivorship, tiering, endemism and eurytopy. Regions on either side of the Cincinnati Province were dominated by inferred immigrants from Baltoscandia. Al‐logenic provincial succession produced time‐averaged mixed faunas in regions near the provincial boundaries. Although most generic originations took place within the Cincinnati Province, evolutionary novelties are associated with the Reedsville‐Lorraine Province. The loss of the diverse Cincinnati Province, connected with global cooling and a eustatic lowering of sea level, may have been a chief factor in the Late Ordovician extinction of bryozoan genera. Genera from the Red River‐Stony Mountain Province differentially survived into the Silurian.
  • Editor: Oxford, UK: Scandinavian University Press
  • Idioma: Inglês;Norueguês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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