Identifier: watersupplyirrig224unit (find matches)
Title: Water Supply and Irrigation Papers of the United States Geological Survey
Year: 1909 (1900s)
Authors: United States Geological Survey
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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rmorizedlimestones are found in large bodies. None of the rocks of this type have any value as water bearers.So far as water in commercial quantities is concerned they arepractically impervious. East and west of these metamorphic andintrusive masses much younger rocks of totally different charactercover extensive areas. West of the San Jacinto mass blue andbuff shales, with occasional traces of vegetal remains and of fresh-water shells, extend along the ridge between San Timoteo Canyonand the San Jacinto Valley nearly to Colton. These imperviousshales are overlain unconformably by heavy bodies of alluvium madeup of well rounded river cobbles, sands, and clays intermingled or inalternating beds. In this region the attitude of these rocks andtheir porosity make them valuable water bearers, and in the Yu-caipe Valley and San Timoteo Canyon near Redlands deep wellshave been drilled in them which yield water in sufficient quantities U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER NO. 225 PL. II
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RED CANYON, NORTHEAST OF MECCA. GEOLOGIC SKETCH. 11 to irrigate near-by lands. The age of these consolidated sedimentsis not known with certainty, but it is probably Pliocene. East of the point of the Santa Rosa Mountains rocks that are sim-ilar in general character though probably older, but about the detailsof whose distribution and structure very little is known, extendsouthward to the Mexican boundary. These areas were traverseaby Professor Blake from the Santa Rosa Mountains to Carrizo Creek,and in Ids report upon that region he describes them as highly foldedand exhibiting the usual Tertiary sedimentary succession of sand-stone and shale. More detailed work has been done in the vicinity of Carrizo andBlack mountains by the writer, and something has been learned ofthe stratigraphic sequence and of the structures there. The basalmembers of the sedimentary series in Carrizo Mountain are usuallyconglomerates of limited thickness, 100 to 200 feet being about theusual measure. Overlyi

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