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Solenoceras Ammonite, double (BU792)
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Solenoceras sp.
Upper Cretaceous Maastrichtian
Black Mitten Member
Pierre Formation
Custer County, South Dakota USA
This is a very rare specimen with two Solenoceras on one piece of matrix. Solenoceras is a heteromorphic Ammonite in that it changes shape in the growth pattern. Solenoceras appears similar to a hairpin.




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