Hell Creek Formation, Harding County (South Dakota, USA)
Late Cretaceous, circa 66 Million Years Ago

object 26 3/4 x 20 x 5 3/4 in. (67.9 x 50.8 x 14.6 cm)
overall 28 3/8 x 20 x 8 3/8 in. (72.1 x 50.8 x 21.3 cm)

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