Rudist Bivalve Fossil | Saudi Arabia | Late Cretaceous ammolite 25” x 1” and weighs

25” x 1” and weighs

The fibrous crystals with translucent radial fractures or globular clusters range from pale green to emerald green in color

These dark red-violet rose rocks consist of sandy crystals of barite (barium sulfate) in petal-like clusters that resemble a rose in full bloom

This exceptional specimen from Dalnegorsk

This specimen features sharp

Rudist Bivalve Fossil | Saudi Arabia | Late Cretaceous ammolite 25” x 1” and weighsRudist bivalves are an extinct marine mollusk that operated as major reef builders in the Late Cretaceous. Their shell structure was heteromorphic, they often possessed a thick, calcitic attached valve and a smaller free upper valve. While rudists themselves are known for their strange and varied shapes, some groups within this subclass exhibit homeomorphic evolution, where unrelated species evolved similar, often parallel forms. This item is 5 x 4