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Survival depended on large numbers to offset losses caused by predators and environmental stresses such as drought
which is part of the class Cephalopoda
A keeled breastbone anchored powerful flight muscles
Adult males reached shoulder heights between 2
it was highly sought after
4.1" Lobatopteris Fossils Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Troodon Survival depended on large numbersLocation: Francis Creek Shale Formation, Illinois Weight: 12 Ounces Dimensions: 4. 1 Inches Long, 3. 4 Inches Wide, 0. 9 Inches Thick (Nodule) Leaf Dimensions: 4. 1 Inches Long, 3. 4 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Lobatopteris 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
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