| Country of Origin | United States |
|---|---|
| Siderite Nodule | Fossil |
| Septarian | Concretion |
| Locality | Illinois |
Check the listing for details. Mazon Creek Fossil Bivalvia Clams Molluscs Fossils Pennsylvanian Period R7. Condition: Used, Made in United States. Listed at 49.95 USD. R7..Up for a Buy Now Auction is a Mazon Creek Fossil Bivalvia Aquatic molluscs Clams .If you buy now you get the fossils pictured. You get the positive and negative half of the fossils. These fossils are from the Pennsylvania Period 350 Million years ago. The fossil sets were found in the Braidwood Illinois Area at the strip mines. If you buy now you will get the fossils pictured.