Naco Formation
Geologic formation in Arizona
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The Naco Formation is a geologic formation in Arizona. It preserves fossils dating back to the Pennsylvanian subperiod.

| Naco Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
| Type | Formation |
| Lithology | |
| Primary | Limestone |
| Other | Shale, siltstone |
| Location | |
| Region | Arizona |
| Country | United States |

Fossils from the Kohls Ranch locality of Gila County, Arizona, include bivalve and gastropod molluscs, brachiopods, bryozoans, crinoids, cnidarians and chondrichthyan teeth.[1][2]
