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Punctal density in the Ordovician orthide brachiopod Paucicrura rogata: anatomical and paleoenvironmental variation

Ackefsy, Spafford C. ; Cisne, John L. ; Railsback, L. Bruce ; Anderson, Thomas F.

Lethaia, 1993-03, Vol.26 (1), p.17-24 [Periódico revisado por pares]

Oxford, UK: Scandinavian University Press

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  • Título:
    Punctal density in the Ordovician orthide brachiopod Paucicrura rogata: anatomical and paleoenvironmental variation
  • Autor: Ackefsy, Spafford C. ; Cisne, John L. ; Railsback, L. Bruce ; Anderson, Thomas F.
  • Assuntos: Brachiopoda ; caeca ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Invertebrate paleontology ; Marine ; Ordovician ; Orthida ; paleoceanography ; paleoecology ; Paleontology ; punctae ; Taconic Basin
  • É parte de: Lethaia, 1993-03, Vol.26 (1), p.17-24
  • Notas: 10.18261/let
    ArticleID:LET17
    ark:/67375/WNG-9TW9R1DF-F
    istex:89A1135F299B9E37E8103D13977CA32F89863244
    Department of Geology, University of Georgia, Athens, Georgia 30602, U.S.A.
    Colorado Rocky Mountain School, Carbondale, CO 81623, U.S.A
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: In the orthide brachiopod Paucicrura rogata, from the Upper Ordovician of New York, the density of punctae (small perforations in the shell) increases from about 350 to about 450 per mm2 of shell in the transition from shallow‐water limestones to black graptolitic shales down the outer slope of the Taconic Trench. Punctal density is significantly correlated with water depth, as measured by distance downslope along individual volcanic ash layers, and by reciprocal averaging score for macroinvertebrate fossil assemblages (p < O.01). Because punctal density increases with temperature in living brachiopods, the results suggest that water temperature increased with depth in the Taconic basin, corroborating similar conclusions based on Paucicrura's oxygen‐isotopic composition. The increase in punctal density with increasing water depth may also reflect reduced shell growth rates of P. rogata in oxygen‐deficient bottom waters, causing a reduction in spacing between punctae. Ontogenetic decrease of punctal density with increasing shell size reflects differential rates of puncta formation at the shell margin.
  • Editor: Oxford, UK: Scandinavian University Press
  • Idioma: Inglês;Norueguês
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