West Middle Fork Powder River #3 About 100 ft S of #2. Measuring up from top of sands into unit 4, to section in 3.01 Sandstone, silty & clayey, grading upward to silty claystone, light gray, chiefly friable (= unit 3 sect. 1) 7.0 Claystone, gray at base, silty, becoming lighter gray mottled with red above, some Fe yellow stain. Upper 1.0 is sandy, yellow stained silt, coarse grained (1 foot±) 1.6 Sandstone, chiefly fine-grained with silt. coarse grains, granules clt qts. Gray white, weathes O-B + buff, irreg, with Brown to blacker weather. second. calc. zones. Becomes clayey (latterly + friable, has locally large sperulite pecks up to 1mm diam. 3.8 Sandstone, fine-med gr, silty loc. @ sandy siltst, light gray. with 67