| OCR Text |
Show 154 thickness may be seen. These fluviatile-sandstone lenses have trough type cross-bedding which has Wind-blown degrees. average inclination of less than 15 an deposits, such cross-beds whose average dip is The average calcareous cement 13 per cent, grains 83 per cent. 20 over composition the as Navajo sandstone, degrees. of the sandstone is secondary silica 4 Of the detrital per cent, chert and per cent. Heavy minerals contained in it are garnet, rutile, anatase, biotite, spinel grains masured and was bedded to light greenish gray structureless; sandstone in the mudstone from A depositing south central of the to present outcrop heavy minerals 7 apatite. The average grayish-red, a It is dark horizontally beds 1 to 2 feet thick are found place. streams flowed part of Utah. approx zircon, tourmaline, in color. stratification study made cross shows the place cent, detrital .175 millimeters. The mudstone between the sandstones is reddish brown to follows: grains, quartz comprises per diameter of the quartz as per imately 86 cent, feldspar 7 have The on north, source of the Salt Wash. the Salt Wash sandstone east and southeast from the area An indicated unconformity of the Dakota group cuts out the Morrison to the west to the west was at the base limiting the information in that direction. Physiographic expression produce of a - series of benches and The ledges, slope. The 10 to ledges stone intervals and sandstone ledges. 20 feet are thick, ledges in the Salt Wash Where there is ledges. sandstone lenses the Salt Wash is five sandstone a coa Ie scene a locally rugged; elsewhere form a ragged but separated by steep slopes, generally covered by four or readily accessible formed talus from the on the mud over11i |
