AMM270 Ammonite Fossil (South Dakota) Polished Pebbles 's 40th anniversary in 2011

's 40th anniversary in 2011

with the frogs in a brighter green clinging to the sides

This large polished slab features shades of tan and earthy green jasper with red and black detailing

Angelwing Chalcedony tops are also possible

This specimen contains gold

AMM270 Ammonite Fossil (South Dakota) Polished Pebbles 's 40th anniversary in 2011This 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