Type Formation Country United States Primary Limestone | Other Shale, siltstone Region Arizona | |
The Naco Formation is a geologic formation in Arizona. It preserves fossils dating back to the Pennsylvanian subperiod.
Fossils from the Kohls Ranch locality of Gila County, Arizona, include bivalve and gastropod molluscs, brachiopods, bryozoans, crinoids, cnidarians and sharks teeth.
References
Naco Formation Wikipedia(Text) CC BY-SA