Facies

, 55:259

Oncoid-dwelling foraminifera from Late Jurassic shallow-water carbonates of the Northern Calcareous Alps (Austria and Germany)

Original Article

Abstract

Oncoidal limestones with different oncoid types are ubiquitous in back-reef open-lagoonal and, to a minor amount, in closed-lagoonal facies of the Late Jurassic Plassen Carbonate Platform of the Northern Calcareous Alps. A common feature of the oncoids from moderately to well-agitated open-lagoonal habitats are incorporated small trochospiral benthic foraminifers, tentatively assigned to trochamminids, switched between individual micritic layers. Their life style is discussed concluding a specialized feeding on cyanophytes on the outer side of the oncoids and later becoming biomurated by successive sheet formations due to oncoid growing.

Keywords

Oncoid Benthic foraminifera Biomuration Plassen Carbonate Platform Late Jurassic 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.MunichGermany
  2. 2.Department for Applied Geosciences and Geophysics, Prospection and Applied SedimentologyUniversity of LeobenLeobenAustria

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