4.2" Macroneuropteris Fossils Leaf Mazon Creek Nodule Pennsylvanian Age Split-Pair Beringiaphyllum The skull of Halisaurus reveals

The skull of Halisaurus reveals much about its predatory strategy

Their bodies were divided into three longitudinal lobes—a central axial lobe bordered by two pleural lobes—giving them their name

while later Ammonites developed highly complex

can sometimes be unreliable due to the mobility of uranium isotopes

4.2" Macroneuropteris Fossils Leaf Mazon Creek Nodule Pennsylvanian Age Split-Pair Beringiaphyllum The skull of Halisaurus revealsLocation: 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