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Central to this ancient lake-bed
derives its deep pink hue from cobalt inclusions
enabling it to efficiently chew and process tough plant material
occupying similar ecological niches in slow-moving or stagnant aquatic environments alongside other amphibians
3.2" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Cave bear Central to this ancient lake-bedLocation: Francis Creek Shale Formation, Illinois Weight: 9. 5 Ounces Dimensions: 3. 8 Inches Long, 3. 1 Inches Wide, 0. 7 Inches Thick (Nodule) Leaf Dimensions: 3. 2 Inches Long, 3 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Pecopteris Fossil Leaves 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