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It shows translucent yellow to white concentric banding
and a large bird soaring overhead
but can also display yellow
A variety of common opal
AMM269 Ammonite Fossil (South Dakota) Tourmaline It shows translucent yellow toThis 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 complex leafy suture patterns in light and dark brown, some filled with pale yellow calcite. Some sections of pearly shell remain that show strong rainbow iridescence. 4. 75" x 3. 5" 10. 8oz
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