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The El Modeno volcanics form a series of extrusive pyroclastic and flow rocks which crop out near El Modeno, Orange County, Calif. The volcanics have been divided into three members. The basal unit is a basalt flow, which is overlain successively by a palagonite tuff and tuff breccia member and an andesite flow and flow breccia member. The volcanics are products of both subaerial and submarine extrusion of materials of intermediate composition. They are middle Miocene to early late Miocene in age and are tentatively correlated with the Glendora volcanics 25 miles to the northwest. The maximum outcrop thickness of the volcanics is 850 feet. The extrusive volcanic rocks may be distinguished from the middle Miocene intrusive rocks in this region by their vesicular texture and characteristic alteration to crumbly, earthy masses. The intrusive rocks are commonly coarser grained, hard and dense, commonly contain biotite, have an ophitic texture, and alter to chlorite-epidote-feldspar rocks.

Volcanic rocks of the El Modeno area, Orange County, California