Nittel, P. (2006). Beiträge zur Stratigraphie und Mikropaläontologie der Mitteltrias der Innsbrucker Nordkette (Nördliche Kalkalpen, Austria). Geo.Alp. 3: 93-145.

336577

Nittel, P.

2006

3: 93-145

Publication

https://www.zobodat.at/pdf/GeoAlp_003_0093-0145.pdf

Available for editors   [request]

North of Innsbruck, in the area of Nordkette (Karwendel range, Northern Calcareous Alps, NCA) a variegated Middle to lower Upper Triassic (Cordevolian) sucession of shallow-water carbonates is preserved, and includes the Steinalm-, Reifling- and Wettersteinkalk-Formations, respectively. The Steinalm-Formation accumulated under favourable ecological conditions, from prevalently shallow waters, and comprises the first Triassic carbonate platform of the NCA. The thickness is laterally variable, because of different rates of sedimentation. The bioclast spectrum is characterized by abundant dasycladaceans, foraminifera and brachiopods. Following a rise of sea-level, the Reifling-Formation accumulated as the basinal equivalent to and that interfingered with the Wettersteinkalk-Formation. In the Reifling Formation, the nodular limestones of the Knollenkalk-Member and the bedded limestones of the "Seegrube-unit" are relatively poor in foraminifera and radiolaria, whereas "filament" shells are common. In addition, three thin intervals of "pietra verde" interpreted as volcanic tuffitic deposits are present. The succession of the Wettersteinkalk-Formation shows a differentiation into reef slope, reef, backreef and lagoon. Because of platform progradation, the slope to reef facies belt is overlain by limestones that accumulated from backreef to lagoonal environments. The reef limestones are characterized by sphinctozoans (Solenolmia manon, Vesicocaulis carinthiacus, Colospongia catenulata), encrusting organisms (Tubiphytes, Ladinella porata) and microproblematica (Tubiphytes, Baccanella floriformis, Ladinella porata). Whereas benthic foraminifera are most common within the lagoonal sucession, dasycladaceans are present only in the lagoonal limestones, and can be used as biostratigraphic index fossils and as proxy indicators for the distance to the reef belt. Two new species are described from lagoonal limestones of the Wettersteinkalk-formation, the foraminifer Austrocolomia carinata and the dasycladacean Probolocuspis aculeata.

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