4.3" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Foot Print " was a formidable hadrosaurid

" was a formidable hadrosaurid dinosaur from the Maastrichtian stage of the late Cretaceous

are subjected to intense heat and pressure

Ruby in Zoisite is a naturally formed mineral aggregate

phylogenetic analysis places them as basal crurotarsans

with eyes positioned high on the head

4.3" Pecopteris Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Foot Print " was a formidable hadrosauridLocation: 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