This article contains a list of fossil-bearing stratigraphic units in the state of Rhode Island, U.S.
| Group or Formation | Period | Notes |
|---|---|---|
| Allegheny Formation | Carboniferous | |
Cornwallius is an extinct herbivorous marine mammal of the family Desmostylidae. Cornwallius lived along the North American Pacific Coast from the Early Oligocene (Chattian) through the Oligocene and existing for approximately 7.8 million years.
The Bass Islands Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Chamberlain's Brook Formation is a thin but distinctive geologic formation of dark red calcareous mudstones that crops out from Rhode Island to Massachusetts and, Nova Scotia, New Brunswick and Newfoundland. It preserves fossils, including trilobites, dating back to the lower mid-Cambrian period. Its lowermost member is the Braintree Member and the uppermost member is the Fossil Brook Member.
The Ouray Formation is a geologic formation in Colorado. It preserves fossils dating back to the Devonian period.
The Lime Island Formation is a geologic formation in Michigan. It preserves fossils dating back to the Silurian period.
The Put-in-Bay Dolomite is a geologic formation in Michigan and Ohio. It preserves fossils dating back to the Silurian period. The type locality is South Bass Island in western Lake Erie.
The Garden Island Formation is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
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