GRANEROS SHALE 15. Shale, medium-dark-gray weathering dark yellowish gray, slightly silty, thinly laminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 14. Bentonite (bentonite marker bed), pale-grayish-yellow weathering dark yellowish orange, slightly silty. . . . . . . . . . . . . . . . . . . . . . . . . 0.7 13. Shale, like 15, with very thin lenses of skeletal limestone and cal- careous quartz siltstone in upper 0.5 foot; FOSSILS - Inoceramus sp., Ostrea beloiti. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 12. Calcareous sandstone, weathered moderate yellowish brown to grayish orange, quartzose, very fine grained, silty, thinly laminated to gently cross-laminated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 11. Shale, dark-gray, slightly silty, jarosite-stained, with specks of car- bonaceous matter, thinly laminated, weathers flaky; FOSSILS - Ostrea beloiti, fish scales. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.8 10. Calcareous sandstone,dark-greenish-gray weathering dark yellowish orange, quartzose, thinly bedded, tightly cemented, very hard; FOSSILS - Ostrea beloiti . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 9. Shale, olive-gray, silty, thinly laminated, weathers flaky, with thin laminae of quartz silt, specks of carbonaceous matter, jarosite and some limonite staining . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.65 8. Skeletal limestone, light-olive-gray weathering dark yellowish orange, quartz sandy, some rounded bone pebbles, crowded with shells of Ostrea; FOSSILS - Ostrea beloiti, Inoceramus sp., fish teeth. . . . . . . . . . . . 0.3 7. Shale, medium-dark-gray to olive-gray, silty, thinly laminated, weathers flaky, jarosite-stained, lenses of very fine grained quartz sandstone in basal 1 foot; two bentonite beds in upper 0.7 foot are very pale orange to light olive gray; FOSSILS - Inoceramus sp. . . . . . . . . . . . . . . 3.1 6. Calcareous sandstone, dark-greenish-gray weathering dark yellowish orange, quartzose, very fine grained, thinly laminated to gently cross-laminated, obscurely ripple-marked; FOSSILS - fish scales. . . . . . . . . . . . . . 0.4 5. Shale, medium-dark-gray, slightly silty, thinly laminated, weathers flaky, with specks of carbonaceous matter, jarosite-stained, with two very thin beds and many thin laminae of quartz silt; bentonite seam is light olive gray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 4. Sandstone, weathered dark yellowish orange, quartzose, thinly laminated to gently cross-laminated, ripple-marked, limonitic, gypsiferous. . . . 0.2 3. Shale, like 5, with two bentonite seams, the upper with sparse marcasite nodules, light-olive-gray . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 2. Sandstone, light-olive-gray, quartzose, silty, thinly laminated to gently cross-laminated, ripple-marked, jarosite-stained, with specks and flakes of carbonaceous matter; FOSSILS - Callistina lamarensis, Parmicorbula? hillensis var., Ostrea sp., fish scales . . . . . . . . . . . . . . . . 0.15 1. Shale, like 7, with numerous very thin beds and lenses of light-olive- gray thinly laminated quartzose siltstone; subaqueous plastic flow structure in argillaceous very fine grained silty sandstone layer near top of unit; FOSSILS - Callistina lamarensis. . . . . . . . . . . . . 3.0 Thickness of exposed part of Graneros Shale . . . . . . . . . . . . . . . . 22.1 Total thickness of measured section . . . . . . . . . . . . . . . . . . . . . 118.5 53