AMM271 Ammonite Fossil (South Dakota) Collector and see if you can

and see if you can collect them all

so that the interesting formations in the Blue Opal can be seen

and are often referred to as “composite cabochons

brecciated patterning and moss agate

4cm x 12cm polished face

AMM271 Ammonite Fossil (South Dakota) Collector and see if you canThis 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.