3.6" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Cave bear which are the skeletal remains

which are the skeletal remains of individual coral polyps

metamorphic

these horns grew from small bumps into enormous structures

This is comparable to how ceratopsian dinosaurs used differences in horns and frills to distinguish between genera

This combination of strength

3.6" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Cave bear which are the skeletal remainsLocation: Francis Creek Shale Formation, Illinois Weight: 11. 2 Ounces Dimensions: 3. 7 Inches Long, 2. 7 Inches Wide, 1. 2 Inches Thick (Nodule) Leaf Dimensions: 3. 6 Inches Long, 2. 3 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Pecopteris Fontainei 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