Masillamys
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Masillamys is an extinct genus of rodent. It was named in 1954 by Tobien based on fossils found in the Messel Pit, Germany. It is considered to be a sister genus to the Hartenbergeromys, Lophiparamys,
Juvenile
Messel Pit
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The Messel Pit is a fossil preservation site in Hesse, central Germany, dated to the Eocene epoch. The fossil-bearing rock unit is a geologic formation named the Messel Formation; its geographic range
Weathered bituminous shale of the Messel Formation
Outcrop of the Messel oil shale near the center of the pit
A fossil of the primitive mammal Kopidodon, showing outline of fur