AMM270 Ammonite Fossil (South Dakota) Polyhedroids and translucent yellow calcite

and translucent yellow calcite

dark golden yellow

25" x 2" x 1

Size range is approximately 2 - 3 inches in length

068 kg / 0

AMM270 Ammonite Fossil (South Dakota) Polyhedroids and translucent yellow calciteThis ammonite specimen comes from South Dakota in the Cretaceous period when the area was submerged by the Western Interior Seaway millions of years ago. They are typically preserved in hard concretions that must be carefully removed. This sizeable fossil shows leafy suture patterns and outer ridges in pale yellow calcite and shades of tan and brown. 4" x 3" 6oz (172g) Ammonites are prehistoric nautilus related to the modern day nautilus, squid, and