strati.ch - Lexique lithostratigraphique de la Suisse

Représentation et statut

Variantes historiques: --- (Baudin et al. 1995), Starlera-Decke, Starlera nappe (Huber 1999, Carrupt 2003)

Description: Milnes & Schmutz 1978: The basement/cover contact is marked over much of the area by a thin, flaggy quartzite horizon, sometimes with a basal conglomeratic layer, overlain by a thick sequence of partly dolomitic marble with local carneole masses. In places, small lenses of dark shale occur between the quartzites and the marbles. Although no fossils have been found, this sequence corresponds well with other Alpine (Permo-)Triassic stratigraphie columns (conglomerate Permian, see Streiff 1939, Zurflüh 1961; dark shale lower Anisian, see Trümpy et al. 1969). and it will be referred to as «Trias» for short. The basal quartzites are everywhere autoch¬ thonous with respect to the adjacent basement, whereas the carbonates are obvious¬ ly considerably disturbed (containing masses of Roffna gneiss and Bündnerschiefer slices at a number of localities). However, the impression is that they are not far removed from their original stratigraphie position, so they are considered to be parautochthonous with respect to the basement. In spite of the evidence for strong internal deformation, the marbles are still quite massive and often devoid of a macroscopically visible deformational fabric.

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