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

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

Strombus bubonius (now commonly referred to as Persististrombus latus) is a fossil gastropod found in marine terrace deposits throughout the Mediterranean region of Spain

Ruby in Zoisite is a naturally formed mineral aggregate

yet they remain some of the most important index fossils used by paleontologists

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