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Crystallizing in the cubic system
These fossil clams are abundant in the Florida Keys
Its heaviness distinguishes it from most similar minerals
with its extinction likely driven by a combination of climate change and hunting pressures from early humans
perfectly adapted for preying on small surface-dwelling fish like Knightia
4.2" Macroneuropteris Fossils Leaf Mazon Creek Nodule Pennsylvanian Age Split-Pair Spinosaurus Crystallizing in the cubic systemLocation: Francis Creek Shale Formation, Illinois Weight: 11. 9 Ounces Dimensions: 4. 7 Inches Long, 2. 6 Inches Wide, 1 Inch Thick (Nodule) Leaf Dimensions: 4. 2 Inches Long, 1. 3 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Macroneuropteris Fossil Leaf The Mazon Creek fossils date back to the Pennsylvanian sub period (roughly 307 million years ago). During this time, the area was a tropical delta
