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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Image Comments
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By Psittacosaurus · Posted
The groovelessness on some jaguar canines is really interesting. As they switch to more durophagous masticating habits (e.g. eating Caimans and turtles), the canines can't afford to have grooves that are more for cutting meat, yet create a weak point on the force distribution.
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By debivort · Posted
On further examination, I think these are both P. turriculatum
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By ThePhysicist · Posted
Thank you, I definitely don't take them for granted; they are pristine teeth from a cool shark!
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By Jaybot · Posted
Beautiful squalies, and beautiful photography!
While regarded as common, Squalicorax are one of my favorite lamniformes
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