3.5" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Ammonites the name TRILOBITE meaning "three-lobed"):

the name TRILOBITE meaning "three-lobed"): a central axial lobe

Prognathodon was a mosasaur that lived in the oceans during the Cretaceous Period (about 100–66 million years ago)

and weathered volcanic ash layers

Horns tend to be larger in males and smaller in females

3.5" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Ammonites the name TRILOBITE meaning "three-lobed"):Location: Francis Creek Shale Formation, Illinois Weight: 1 Pound 13. 7 Ounces Dimensions: 5. 4 Inches Long, 3. 7 Inches Wide,1. 4 Inches Thick (Nodule) Leaf Dimensions: 3. 5 Inches Long, 2. 1 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Annularia 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