Hoploscaphites Nicoletti

This Hoploscaphites nicoletti fossil ammonite is from the Trail City Member of the Fox Hills Formation (Late Cretaceous, Maastrichtian) of South Dakota. The ammonite measures approximately 2.3 inches in diameter, and sits on a base of original matrix that measures approximately 4.5 x 6 inches. The whole ammonite was "popped" out from the matrix upon which it rests, and is equally well preserved on both sides. The shell has a beautiful pearly iridescent sheen.