AMM271 Ammonite Fossil (South Dakota) Collector 33mm x 33mm

33mm x 33mm

with banded agate in yellow and white with a small quartz pocket in the middle

4cm x 12cm polished face

where to look for them

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

AMM271 Ammonite Fossil (South Dakota) Collector 33mm x 33mmThis 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.