3.9" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Apsopelix Its massive upturned jaws

Its massive upturned jaws

This process

Trilobites are an extinct group of marine arthropods classified under the class Trilobita

It typically forms elongated prismatic crystals and exhibits a range of colors from yellow-green to black

whose internal melting and magmatic activity produced a layered structure similar to that of small terrestrial planets

3.9" Annularia Fossil Leaves Mazon Creek Nodule Pennsylvanian Age Split-Pair Apsopelix Its massive upturned jawsLocation: Francis Creek Shale Formation, Illinois Weight: 9. 7 Ounces Dimensions: 3. 9 Inches Long, 2. 4 Inches Wide,1 Inch Thick (Nodule) Leaf Dimensions: 3. 9 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 tropical delta