argillaceous sandy siltstone grading upward to friable silty sandstone, upper 6.0 chiefly sandstone. This unit grades downward into following. 9.) 13.0 Siltstone, argillaceous, hard block, grading downward into silty shale. 8.) 3.0 Shale, clay, plastic,- light gray to drab few silty zones 7) 0.4 Bentonite 6) 18.0 Shale as in 8) above 5) 1.0 Sandstone, fine-grained, silty, laminated, grades into unit below 4) 13.0 Sandstone, argillaceous, and sandy to silty shale. Thin bed of fine-gr. silty sandstone at base 3) 33.0 Shale, silty to sandy, gypsiferous, 2) 5.0 Shale, black, fissile , with 0.1 bentonite 1.8 above base disconformity 1) — Chrysotone, green and gray-green (very fine sand less than 0.1 locally at contact) 10