The purpose of this article is to describe a deposit of hard stream conglomerate that has been laid down during the late Quaternary and is still in process of-formation in the valley of White creek, in the western part of Fresno county, California. This stream is a branch of Los Gatos creek, which flows southeastward from the Diablo range, the easternmost member of the Coast ranges, and enters the San Joaquin valley at Coalinga. The deposit was observed by the writers in the summer of 1907, during the progress of an investigation of the Coalinga oil district.
White creek flows from an area of serpentine and other metamorphic rocks and carries much mineral matter, which it deposits on evaporation of the water. The gravel of the valley floor is thus cemented and is changed to a solid pavement, through which the stream subsequently carves a channel, . . .