Reifling formation

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The Reifling Formation is a lithostratigraphic formation of the Triassic in the Northern Limestone Alps and in parts of the Central Alps. The type locality is near Großreifling in the Styrian Ennstal.

history

The term Reiflinger Kalk was used for the first time by the Austrian geologist Franz von Hauer in 1853.

Reiflinger Kalke on the Erlauftal Straße east of Göstling an der Ybbs

definition

The Reifling formation is characterized by wavy to bulbous stratified limestone , which often has chert in the form of layers or pebbles. They are deposits of a sea basin and the pool edge. Characteristic of the formation is the occurrence of tuff or tuff layers in the lower Ladinium.

The Reifling Formation is underlain by the Gutenstein Formation , the Virgloria Formation and the Steinalm Formation . It is laterally interlocked with the Wetterstein limestone and the Hallstatt limestone . In the upper Ladinium it is dovetailed with the Partnach formation or is replaced by it, especially in the Tyrolean and central alpine areas. The formation is overlaid by the Partnach formation, the Wetterstein dolomite , the Reingraben formation , the Göstlinger strata and the Lechkogel strata .

The anisic part of the formation in the western part of the Northern Limestone Alps is up to 100 meters thick, in the eastern Northern Limestone Alps the thickness of this part remains limited to 25 to 30 meters. At the type locality Großreifling, the anise portion is 20 meters thick. The proportion of the ladinium and lower carnium does not quite reach 50 meters in Großreifling, 150 meters in the Frankenfels and Sankt Anton an der Jeßnitz area and up to 190 meters in Göstling .

Chronological order

The formation is dated from the late Anisian through the Ladinian to the early Carnian. However, the formation only reached this relatively large temporal extent in places, especially in the area of ​​the Lunz facies, which can be found primarily in southwest Upper Austria and southern Lower Austria. In the North Tyrolean facies area, on the other hand, the formation only extends slightly above the anisium.

Fossil guide

The ammonites are an important element of the macrofauna , in the anise zone there are among others Paraceratites trinodosus , Flexoptychites studeri and Flexoptychites flexuosus . In the Ladinium it is, among other things, Protrachyceras reitzi . Fossil discovery points can be found at the Salzach Bridge in Großreifling or at the Kerschbuchhof near Innsbruck- Kranebitten. Another important element of the macrofauna are the brachiopods . Microfossils include conodonts , radiolarians and ostracods , subordinate to foraminifera , holothuria and needles of calcareous and silica sponges .

Subformations

In the transition area to the Wetterstein limestone , Raminger Kalk partially replaces the Ladin and Carnic parts of the Reifling formation. It is also chert-bearing limes, but they have the lighter appearance of Wetterstein limestone and their stratification and bank can occasionally recede. The Raminger Kalke can be up to 300 meters thick. The term Raminger Kalk comes from Alexander Tollmann , in some cases it is also referred to as the Raming formation in the literature . In the terrain, the Raminger limestone can often be distinguished by its late, splintery fracture from the rather shell-like limestone of the Reifling formation.

literature

  • D. Gessner: Classification of the Reiflinger Kalke at the type locality Großreifling ad Enns (Northern Limestone Alps). In: Journal of the German Geological Society. Volume 116, 1964, pp. 696–708 ( abstract , schweizerbart.de)

Web links

Individual evidence

  1. ↑ Alexander Tollmann: Analysis of the classical North Alpine Mesozoic. Stratigraphy, fauna and facies of the Northern Limestone Alps . (= Monograph of the Northern Limestone Alps. Part 2). Verlag Deuticke, Vienna 1976, ISBN 3-7005-4412-X , p. 87.
  2. ↑ Christoph Janda: Geological - facial investigations in the Lunzer ceiling southwest of Weyer (Upper Austria). Thesis. Vienna 2000, pp. 20 ff ( PDF file , univie.ac.at, accessed on July 22, 2009).
  3. ↑ Alexander Tollmann: Analysis of the classical North Alpine Mesozoic. Stratigraphy, fauna and facies of the Northern Limestone Alps . (= Monograph of the Northern Limestone Alps. Part 2). Verlag Deuticke, Vienna 1976, ISBN 3-7005-4412-X , pp. 88, 123.
  4. ↑ Alexander Tollmann: Analysis of the classical North Alpine Mesozoic. Stratigraphy, fauna and facies of the Northern Limestone Alps . (= Monograph of the Northern Limestone Alps. Part 2). Verlag Deuticke, Vienna 1976, ISBN 3-7005-4412-X , p. 88.
  5. ↑ Alexander Tollmann: Analysis of the classical North Alpine Mesozoic. Stratigraphy, fauna and facies of the Northern Limestone Alps . (= Monograph of the Northern Limestone Alps. Part 2). Verlag Deuticke, Vienna 1976, ISBN 3-7005-4412-X , pp. 89f.
  6. ↑ Alexander Tollmann: Analysis of the classical North Alpine Mesozoic. Stratigraphy, fauna and facies of the Northern Limestone Alps . (= Monograph of the Northern Limestone Alps. Part 2). Verlag Deuticke, Vienna 1976, ISBN 3-7005-4412-X , p. 129.
  7. ↑ Michael Moser: Report 2004 on geological surveys in the Lassing - Mendlingbach - Scheibenberg area on sheet 101 iron ore. Mapping report of the Federal Geological Institute as a PDF file , accessed on July 23, 2009.