Geology of Eel River Valley Area, Humboldt County, California

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. 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.