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Article: Upper Ordovician bryozoans of the Pin Formation (Spiti Valley, northern India)

Publication: Palaeontology
Volume: 50
Part: 6
Publication Date: November 2007
Page(s): 1485 1518
Author(s): Thomas J. Suttner and Andrej Ernst
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How to Cite

SUTTNER, T. J., ERNST, A. 2007. Upper Ordovician bryozoans of the Pin Formation (Spiti Valley, northern India). Palaeontology50, 6, 1485–1518.

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Twenty-nine species of bryozoans from the Upper Ordovician-Lower Silurian Pin Formation (Spiti, India) have been identified. Eight of these are new: Trematopora minima, Ulrichostylus bhargavai, Ptilodictya exiliformis, Phaenopora ordinarius, Oanduellina himalayaica, Pesnastylus? vesiculosum, Ralfina? originalis and Pinocladia triangulata. The fossil record and facies analyses of the area investigated indicate shallow-water conditions within the subtropical-tropical realm. The distribution pattern of fossils among the Ordovician/Silurian succession on the Northern Gondwana shelf and the influence of the Late Ordovician cooling phases on marine organisms are distinctive owing to a dramatic reduction in diversity globally. As far as the bryozoan taxa of Spiti are concerned, only one (Helopora fragilis) of the 29 species was recorded above the Ordovician/Silurian boundary. Observed bryozoan communities are very similar to faunas of Laurentia, the Baltic, Siberia and southern China of early-late Ordovician age.
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