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Excellent Sphenodiscus from South Dakota
AMMONITES • UNITED STATES
Stock Number XIAUS111
EXTINCTIONS Choice

Name:   Sphenodiscus lenticularis
Age:  Cretaceous
Formation:  Fox Hills Formation
Location:  South Dakota
Size:  Ammonite is 2.2 inches across
This specimen is not for sale
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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 natural coloration of the fossil is quite striking and contrasts beautifully with the grayish-brown matrix. The ammonite is wonderfully presented on the large, natural block of concretionary matrix that also contains many other fossils. This is a fine example of this unusual ammonite from the Fox Hills Formation.