Abstract
The upper lower through lower middle Eocene Domengine Sandstone crops out in the southern Diablo Range in the Alcalde and Big Blue Hills. The formation reaches a maximum thickness of 65 m and is overlain by the deep marine shales of the Kreyenhagen Formation. The Domengine unconformably overlies the Cretaceous Panoche Formation in the Alcalde Hills and lower Eocene Yokut Sandstone in the Big Blue Hills. The Domengine in the Alcalde Hills was deposited on a fluvial-dominated delta. The formation contains interdistributary bay, swamp, distributary-channel and levee, and overbank flood deposits. Distributary-channel and levee, and overbank flood deposits. Distributary-channel deposits consist of pebble conglomerate and crossbedded sandstone. The associated levee deposits consist of sandy mudstone and fine-grained sandstone and contain mudstone pods and carbonaceous material. Overbank flooding between the distributaries formed claystone deposits. The beach deposits of the interdistributary bay are represented by fine-grained sandstone that contains crossbedding, and parallel and way laminations lined with carbonaceous material. Lenses of Ostrea idriaensis and other brackish-water fauna are abundant. Coarse, fossiliferous sandstone deposits were formed by storms within the interdistributary bay. The transition at the top of the formation between interdistributary bay deposits and deep marine shale is represented by a thinmore » sequence of interbedded sandstone and shale.« less
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