Int J Earth Sci (Geol Rundsch) (2018) 107:1379–1380 DOI 10.1007/s00531-017-1542-1 GEOSITES Diamictites and soft sediment deformation related to the Ries (ca. 14.9 Ma) meteorite impact: the “Blockhorizont” of Bernhardzell (Eastern Switzerland) Diamictites, i.e. poorly sorted sedimentary rocks with bigger clasts embedded in a fine grained matrix, may be formed by a plethora of depositional processes ranging from debris flows, volcanic erup - tions, rockfalls, to sedimentation underneath a glacier (e.g. Eyles and Januszczak 2004; Letsch and Kiefer 2017). Perhaps a more exotic way of producing diamictites is by meteorite impacts and the ballis- tic transport of impact ejecta into finer grained sediments, which may also give raise to secondary surges and debris flows (Rampino 1994). This Geosites contribution describes a particularly instructive exam- ple of a diamictite from eastern Switzerland that formed during the Miocene due to the Ries and Steinheim meteorite impacts in Southern Germany. Situated within the Middle Miocene Upper Freshwater Molasse, i.e. the youngest megasequence of the Molasse Basin (the northern foreland basin of the Alps in Switzerland, Germany and Austria), the so-called “Blockhorizont” crops out along a steep cliff cut by the river Sitter, some 7 km NW of the city of St. Gallen (ca. 47°28′48.3″N Fig. 1 Isolated Jurassic
International Journal of Earth Sciences – Springer Journals
Published: Oct 11, 2017
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