Pecatonica Formation
{{more citations needed|date=October 2017}}
{{Infobox rockunit
| name = Pecatonica Formation
| type = Formation
| age = Ordovician
| period = Ordovician
| prilithology = Limestone
| region = Illinois, Indiana, Iowa and Wisconsin
| country = United States
| unitof = Black River Group
| underlies = Plattin Formation
| overlies = Joachim Dolomite
}}
The Pecatonica Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.
See also
References
{{reflist}}
- {{cite web|title= Fossilworks: Gateway to the Paleobiology Database|author= ((Various Contributors to the Paleobiology Database))|url= https://www.fossilworks.org|access-date= 17 December 2021}}
{{Chronostratigraphy of Illinois}}
{{Chronostratigraphy of Indiana}}
{{Chronostratigraphy of Wisconsin}}
Category:Ordovician geology of Wisconsin
Category:Ordovician southern paleotropical deposits
Category:Limestone formations of the United States
{{Illinois-geologic-formation-stub}}