Drusberg layers
The Drusberg layers are a sedimentary sequence of limestones in the Swiss Alps. They were first defined by Arnold Escher von der Linth in 1867. Since then, their description and delimitation has been refined several times. To this day there is no clear type profile on Drusberg in the canton of Schwyz .
The rocks originated in the Lower Cretaceous ( Barremium ) and belong to the Helvetic layer sequence. They are bordered by silica limestone in the lying area and by Schrattenkalk in the hanging wall. They are characterized by alternating layers of medium, occasionally fine or coarse-banked, slightly marly limestone with schisty marls as intermediate layers . In addition, the limestone can sometimes be yellowish. Sea urchins and oysters are common fossils in the northern facies area. The thickness can be several hundred meters. The Drusberg layers are now part of the Tierwis formation .
Individual evidence
- ^ Lithostratigraphic Lexicon of Switzerland (www.stratigraphie.ch)
- ^ R. Trümpy: Geology of Switzerland. Basel. 1980
- ↑ Bollinger D., The Development of the Distal East Helvetian Shelf in the Barremian and Early Aptian, Diss. University of Zurich, 1988.
- ^ Lithostratigraphic Lexicon of Switzerland (www.stratigraphie.ch)