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Detailed Sphenodiscus Ammonite from South Dakota
AMMONITES • UNITED STATES
Stock Number XIAUS124
EXTINCTIONS Choice

Name:   Sphenodiscus lenticularis
Age:  Cretaceous
Formation:  Fox Hills Formation
Location:  South Dakota
Size:  Ammonite is 1.8 inches across
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This is a very nice US ammonite. It is a Sphenodiscus lenticularis from the Late Cretaceous of South Dakota. This type of ammonite is extremely lenticular in shape. The planispiral shell of the cephalopod has a very sharp keel. This 3-dimensional ammonite is well preserved, and the intricate suture pattern is readily seen. The dark brown coloration of the fossil is quite striking and contrasts beautifully with the grayish-brown matrix. The ammonite is wonderfully presented on the natural block of concretionary matrix that also contains other fossils. This is a very fine example of this unusual ammonite from the Fox Hills Formation.