The schulterkofel section in the Carnic Alps,Austria: Implications for the carboniferous-permian boundary |
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Authors: | Dr Franz Kahler Univ Doz Dr Karl Krainer |
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Institution: | 1. Tarviserstra?e 28, A-9020, Klagenfurt 2. Institut für Geologie und Pal?ontologie, Universit?t, Innrain, A-6020, Innsbruck
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Abstract: | Summary The upper part of the LowerPseudoschwagerina Limestone (Rattendorf Group), outcropping on the northwestern flank of Schulterkofel Mountain, Carnic Alps (Austria) is described
with special emphasis on fusulinid microfossils and facies. This fusulinid-rich section offers an ideal opportunity for biostratigraphy
in defining the Permo-Carboniferous boundary in this region.
The LowerPseudoschwagerina Limestone is composed of shallow-marine limestones with intercalated thin siltstone and sandstone beds.
Fusulinid limestones are represented by two types of wackestones, both containing large quantities of smaller foraminifers.
Fusulinid grainstones are rare. Limestones rich in fusulinids were found only within the bedded limestone facies in beds both
below and especially above siliciclastic intercalations. This may indicate that the best living conditions for fusulinids
existed immediately before and especially after the climax of a regressive phase (sea-level lowstand). The fusulinid limestones
were deposited within a protected, shallow-marine shelf environment with normal salinity.
Pseudoschwagerinid fusulinids appear in the upper part of the LowerPseudoschwagerina Limestone, in samples SK 107d (undeterminable species) and SK 108, i.e. between 92 m and 93 m above the base of the section
within a bedded limestone immediately above the uppermost clastic intercalation.
The fusulinid fauna is represented by about 30 species belonging to only a few genera. Species ofTriticites andRugosofusulina dominate, whereas those ofDaixina, Rugosochusenella andPseudofusulina are rare. A characteristic feature of the fauna is the strong similarity with fusulinid faunas described from Russia as well
as from Middle and East Asia. Some of the described fusulinids are new for the Carnic Alps.
The first appearance ofPseudoschwagerina andOccidentoschwagerina (Occidentoschwagerina alpina Zone) in the upper part of the LowerPseudoschwagerina Limestone in the Schulterkofel section defines the position of the Carboniferous-Permian boundary. |
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Keywords: | Biostratigraphy Carboniferous/Permian Boundary Section Fusulinids Microfacies Southern Alps Carnic Alps (Austria Italy) Late Carboniferous to Early Permian Rattendorf Group LowerPseudoschwagerina Limestone |
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