Spectacular piece of ± 6 x 5 x 4 cm, with an ammonite of ± 3.3 cm in diameter, with a bivalve. This type of ammonite preserves the fossilized shell in mother-of-pearl, which is opalized.
It is not attached to the rock.
Late Cretaceous, Maastrichian, Phox Hills Formation
Upper Cretaceous, Maastrichtian, Phox Hills Formation
N. Central, South Dakota, USA
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