Ctass fIeatfon changed to OFFICIAL [JE ONLy by authority of P. L. Merritt, signatures of person making change,andatethereof Geology-Mineralogy This document consists of 45 pages, plus 2 figures.
Dam o 116-022 EXPLANATION-*-Rock somple (Soprolite) First number or letter-Grid point station Second number-Radiometrjc reading in mr/hr-03-Isorod line showing reading in mr/hr Dashed in area of trenching Th/rc/nts/Tibf Per-ce'rf of isanac//ism ' .3 O "'XjC oncerrtnerf-jo n of / £> e y^ef-ce rrtayc. of o 117-O2I U. S. Geological Survey OPEN FILE Fircri This rr.p or illustration i- .-> »'lininary c-i? IUL-.. I bora ciitsJ o~ «. B-73d for conformity cith Gsolc-ic'l _u. standards cr nomenclature.
2. Mineral composition of Sentinel Butte shale member in southwestern North Dakota, as determined by X-ray diffraction patterns ...*........ 17 3. Mineral composition of the Golden Valley formation (?) as determined by X-ray diffraction patterns e.
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