Water Supply and Irrigation Papers of the United States Geological Survey . d, like themain range farther north and west, is a complex of met amorphicrocks and massive intrusives. Small patches of effusive lavas andassociated tuffs also occur in tins section, overlying the basementcomplex and interbedded in places with the lower members of thesedimentary series. North and east of the Colorado Desert the relations are in a generalway similar to those on the south and west sides. At the base ofthe north wall of San Gorgonio Pass is a belt of folded and faultedalluvial sediments, not more than 2
Water Supply and Irrigation Papers of the United States Geological Survey . d, like themain range farther north and west, is a complex of met amorphicrocks and massive intrusives. Small patches of effusive lavas andassociated tuffs also occur in tins section, overlying the basementcomplex and interbedded in places with the lower members of thesedimentary series. North and east of the Colorado Desert the relations are in a generalway similar to those on the south and west sides. At the base ofthe north wall of San Gorgonio Pass is a belt of folded and faultedalluvial sediments, not more than 2 or 3 miles wide, which locally hasbeen cut down by erosion and buried under modern wash. Where-ever it remains, however, and is exposed for examination the rocksare seen to be coarse sandstones, gritty clays, and heavy conglomer-ates which have been thrown into complex attitudes and brokenalong many lines. North of the sediments are the schists and massive rocks thatmake up the main body of the San Gorgonio Mountain mass. The 12 GROUND WATERS OF INDTO REGION, r~rn—r~i—rn—i
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