Palaeontology of the Middle Turonian limestones of the Nysa Kłodzka Graben (Sudetes, SW Poland): biostratigraphical and palaeogeographical implications
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Date
2012-09-12T07:50:28Z
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Abstract
The ammonites Lewesiceras peramplum Mantell and ?Lewesiceras sp. are reported from the Upper Cretaceous in the
Nysa Kłodzka Graben; they date from the Middle Turonian and ?Coniacian, respectively. The Middle Turonian limestones
of the Stara Bystrzyca quarry contain an abundant assemblage of inoceramids (Inoceramus cuvieri Sowerby and
I. lamarcki Parkinson) and other bivalves, including oysters, as well as brachiopods and trace fossils. Micropalaeontological
data show the presence of foraminifers and siliceous sponge spiculae, bryozoans, ostracods and fragments of
bivalves and gastropods. The Middle Turonian calcareous deposits belongs to the upper part of the Inoceramus lamarcki
Zone (late Middle Turonian) and were deposited on a shallow, subtidal offshore shelf. They overlie the Middle Turonian
Bystrzyca and Długopole Sandstones, which represent foreshore-shoreface delta deposits. The fossil assemblage
suggests a moderate- to low-energy, normal-salinity environment with occasionally an oxygen deficit.
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Middle Turonian, Sudetes, Nysa Kłodzka Graben, ammonites, inoceramids, biostratigraphy
Citation
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18, (2);83-109
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1426-8981