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Russian Upper Kimmeridgian ammonites

Russian Upper Kimmeridgian ammonites

Kimmeridgian is the least pronounced Late Jurassic age in European Russia. Preservation is typically not the best, often pyritized and the fossils themselves are usually found in clay. Better known Upper Kimmeridgian outcrops are located in Ulyanovsk and Samara regions (Volga), Kostroma (Unzha), Kaluga, etc. Typical ammonite genera include Sarmatisphinctes, Aulacostephanus and Aspidoceras/Sutneria. Lots of pyritized Aspidoceras aptichi are usually present in corresponding sites.

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