Coumiac Formation

The Coumiac Formation is a geologic formation in France. It preserves fossils dated to the Devonian period.

The Global Boundary Stratotype Section and Point (GSSP) for the base of the Famennian Stage of the Devonian is located at Coumiac quarry (43.4705°N, 3.0597°W) near Cessenon-sur-Orb.