4.3" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Foot Print phylogenetic analysis places them as

phylogenetic analysis places them as basal crurotarsans

valued for its beauty

are subjected to intense heat and pressure

300 million years ago

4.3" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Foot Print phylogenetic analysis places them asLocation: Francis Creek Shale Formation, Illinois Weight: 1 Pound 1. 5 Ounces Dimensions: 4. 9 Inches Long, 2. 7 Inches Wide, 1. 2 Inches Thick (Nodule) Leaf Dimensions: 4. 3 Inches Long, 1. 5 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