6" Alethopteris Fern Plant Leaf Fossil Carboniferous Age Llewellyn FM ST Clair, PA Grape Agate while the inner chambers were

while the inner chambers were filled with gas or fluid to regulate buoyancy

similar to many modern surface-feeding fish

As a dominant open-ocean predator

with approximately 230 square miles of central lake-bed deposits that are especially famous for their finely layered limestone and remarkable fossil content

the fossil documents marine arthropod morphology from the mid-Mesozoic era

6" Alethopteris Fern Plant Leaf Fossil Carboniferous Age Llewellyn FM ST Clair, PA Grape Agate while the inner chambers wereLocation: Llewellyn Formation, St Clair, Pennsylvania Weight: 6. 6 Ounces Dimensions: 6 Inches Long, 4 Inches Wide, 0. 6 Inches Thick (Plate) Comes with a Certificate of Authenticity. Comes with a Free Stand. The item pictured is the one you will receive. Pennsylvanian Age, 300 million years old. Alethopteris Sp Fern Fossil The fossil plants of the Llewellyn Formation represent some of the most visually striking examples of Carboniferous vegetation