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| Carters Limestone | |
|---|---|
| Stratigraphic range: Middle Ordovician | |
| Type | Formation |
| Unit of | Lower and Upper Members |
| Underlies | Hermitage Formation |
| Overlies | Lebanon Limestone |
| Thickness | 9–28 m (30–92 ft) |
| Lithology | |
| Primary | Thin-bedded to massive limestone |
| Other | Thin shale and bentonite beds |
| Location | |
| Region | Central Basin, Tennessee |
| Country |  United States |
| Extent | Central Tennessee |
| Type section | |
| Named by | J. M. Stafford |
The Carters Limestone is a geologic formation in Tennessee. It preserves fossils dating back to the Ordovician period. The Carters contains abundant invertebrate fossils, including corals, stromatoporoids, brachiopods and bryozoans, mollusk (gastropods, bivalves and orthoconic cephalopods) and trilobites. Trace fossils also occur. The unit has several volcanic ash (bentonite) beds and is known to have isolated reef development.
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