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Ruhpolding Formation
The Ruhpolding Formation is a sedimentary formation of the Northern Calcareous Alps deposited during the Upper Jurassic. The open marine radiolarite is very rich in silica.
== Definitions ==
The Ruhpolding Formation derives its name from its type locality Ruhpolding, a commune in Upper Bavaria situated at the edge of the Northern Calcareous Alps. The type locality, situated southwest of Ruhpolding (at Gschwendlbach near ''Röthelmoos'', ''Urschlau'') is a bad choice as it doesn't show the characteristic red radiolarites found elsewhere in the Austroalpine domain but only grey to red cherty limestones.〔Steiger, E. & Steiger, T.(1994). New radiolaria from the "Ruhpoldinger Marmor" of Urschlau (Late Jurassic, Chiemgau Alps, Bavaria). Abh. Geol. Bundesanst., 50, p. 453-466. Wien〕 This is the reason why Gawlik (2000) suggested a new type profile with a complete development of the radiolarite at ''Mörtlbach'' northeast of Hallein.〔Gawlick, H. J.(2000). Die Radiolaritbecken in den Nördlichen Kalkalpen (hoher Mittel-Jura, Ober-Jura). Mitteilungen Gesellschaft Geologie-Bergbaustudenten Österreich, 44, p. 97-156. Wien〕
The formation is also known as Ruhpolding Radiolarite〔Garrison, R. E., and A. G. Fischer(1969). Deep-water limestones and radiolarites of the Alpine Jurassic. Soc. Econ. Paleontol. Mineral, Spec. Publ., 14, p. 20-56. Tulsa.〕 or Ruhpolding Beds.〔Trauth, F.(1950). Die fazielle Ausbildung und Gliederung des Oberjura in den nördlichen Ostalpen. Verh. Geol. Bundesanst. (Jg. 1948), p. 145—218. Wien.〕
In a wider context all the radiolarites of Late Bajocian, Callovian, Oxfordian, Kimmeridgian and Early Tithonian age are reunited within the Ruhpolding Radiolarite Group (RRG).
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