Geology of Eel River Valley Area, Humboldt County, California #244679

Structures in the Yager sediments generally controlled the later structures in the Wildcat group, and these in turn controlled the post-hookton-formation folds. The principal fold of the region is the east-striking Eel River syncline; smaller anticlines are present to the north and south, and the yager-little Salmon fault truncates these structures to the east. Pre-wildcat-group faults to the northeast and south of the Eel River basin probably aided in the development of a depositional trough. One small gas field (tompkins Hill) has been discovered, and several structures remain to be tested for petroleum.