AMM271 Ammonite Fossil (South Dakota) Graveyard Point Plume Agate Rock pictured both wet and

Rock pictured both wet and dry

Purchase by the piece or in a one pound lot

5cm x 2cm x 3cm

shades of brown

some purple

AMM271 Ammonite Fossil (South Dakota) Graveyard Point Plume Agate Rock pictured both wet andThis 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 mixes of brown and yellow calcite with a smooth surface displaying complex leafy suture patterns. It has a fairly well preserved chamber opening and spots of red, yellow, and green iridescence.