4.2" Macroneuropteris Fossils Leaf Mazon Creek Nodule Pennsylvanian Age Split-Pair Spinosaurus dominating the world’s oceans for

dominating the world’s oceans for over 13 million years

9 gallons (7 liters)—a size that far surpasses any modern bird species and continues to fascinate scientists

perfectly adapted for preying on small surface-dwelling fish like Knightia

These fossil clams are abundant in the Florida Keys

massive skull

4.2" Macroneuropteris Fossils Leaf Mazon Creek Nodule Pennsylvanian Age Split-Pair Spinosaurus dominating the world’s oceans forLocation: Francis Creek Shale Formation, Illinois Weight: 11. 9 Ounces Dimensions: 4. 7 Inches Long, 2. 6 Inches Wide, 1 Inch Thick (Nodule) Leaf Dimensions: 4. 2 Inches Long, 1. 3 Inches Wide The item pictured is the one you will receive. Pensylvanian Age, 370 million years ago Macroneuropteris Fossil Leaf 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