Brown Orthoceras and Ammoite Fossil Plate Slab Size 13 to 14 Inches Crystal Gemstone Home Decor

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Avg Size Range: (13 to 14 inches)

Orthoceras fossils are formed through the gradual replacement of the original organic material by minerals, such as calcite or silica, during the fossilization process, preserving the shell-like structures of ancient cephalopods.

Ammonites were spiral-shelled animals that lived hundreds of millions of years ago, and are most closely related to modern-day octopi and cuttlefish than mollusks. The fossils for these species are so widespread that paleontologists and geologists use them as index fossils to determine when rock layers formed.