Mazon River
| Use attributes for filter ! | |
| Area | 4 |
|---|---|
| Nearest city | Morris |
| Country | United States |
| Added to NRHP | September 25, 1997 |
| NRHP Reference Number | 97001272 |
| Date of Reg. | |
| Date of Upd. | |
| ID | 2175682 |
About Mazon River
The Mazon Creek fossil beds are a conservation lagerstätte found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately 309 million years ago in the mid-Pennsylvanian epoch of the Carboniferous period.
