21. Shaly chalk, medium-olive-gray to very light olive gray weathering grayish orange to very pale orange, tough, laminated, speckled, lower 0.4 foot with hackly surface; FOSSILS - Inoceramus platinus?, Ostrea congesta, fish remains. 1.15 20. Bentonite, 0.05-foot-thick, very pale orange; seams of limonite and gypsum bordering bentonite projecting from slope. 0.11 19. Shaly chalk, similar to 21, with hackly surface; softer and flaky where partly weathered; zone 0.3 to 0.6 foot above base tougher, nonlaminated, caps a few pinnacles; three very thin limonitic seams of bentonite above cap rock zone; FOSSILS - Inoceramus sp., Ostrea congesta. 2.6 18. Shaly chalk and bentonite; chalk similar to 21, with darker colored disk- like patches of non-speckled rock that may have been burrowed; lower part of unit harder, caps numerous pinnacles; unit softer and flaky where partly weathered; bentonite at base 0.1 foot thick, yellowish gray to nearly white; bentonite near middle of unit 0.01 foot thick, limonitic; bentonite at top of unit 0.08 foot thick, pale greenish yellow, sand- swiched between seams of jarosite, limonite, and gypsum; FOSSILS - Ino- ceramus sp., Ostrea congesta, fish scales 1.8 17. Shaly chalk, like 21, with highly burrowed appearance; unit softer and flaky where partly weathered; lower 0.5 foot harder, caps numerous pin- nacles; FOSSILS - Ostrea congesta, Inoceramus sp. 1.45 16. Bentonite, 0.01-foot-thick, pale-greenish-yellow weathering dark yellowish orange, sandwiched between seams of olive-gray granular gypsum. 0.05 15. Shaly chalk and chalky limestone; chalk light olive gray weathering dark yellowish orange to pale yellowish orange, tough, irregularly laminated, speckled, softer and flaky where partly weathered; limestone light olive gray weathering grayish orange to medium yellowish orange, very irregularly laminated, tough, speckled, apparently much burrowed, caps some pinnacles; unit crisscrossed sparingly by seams of gypsum; FOSSILS - Ostrea congesta, fish remains. 2.15 14. Shaly chalk and bentonite, chalk dark yellowish brown to pale yellowish brown weathering grayish orange to pale yellowish brown, tough, very irregularly laminated, speckled; unit possibly much burrowed, weathers softer and flaky; five very thin ferruginous-gypsiferous, dark-yellowish- orange bentonite seams, none more than 0.03 foot thick, middle seam streak- ed moderate reddish brown; unit crisscrossed by seams of gypsum; FOSSILS - large coprolite 2.0 13. Shaly chalk, olive-gray to medium-greenish-gray, stained dark gray to light brownish gray, tough, laminated, speckled; laminae near top highly irregu- lar, unit possibly burrowed; forms steep, spalling face where fresh; softer and flaky with more gentle slope where partly weathered; unit locally much crisscrossed by seams of gypsum. 6.1 12. Limonite and gypsum, dark-yellowish-orange, discontinuous, with thin clay streak in center; probably weathered bentonite. 0.01-0.02 11. Shaly chalk, olive-gray to light-olive-gray, stained medium dark gray, tough, laminated, speckled, locally forms steep spalling slope, softer and flaky where partly weathered; FOSSILS - Inoceramus platinus, Ostrea congesta. 1.8 10. Bentonite, 0.03-foot-thick, dark-yellowish-orange 0.03 9. Shaly chalk, similar to 11; FOSSILS - Inoceramus platinus?, Ostrea con- gesta 1.85 8. Shaly chalk and bentonite; chalk similar to 11; bentonite at base is 0.11 foot thick, yellowish gray, with associated limonite and jarosite; second bentonite seam is 0.05 foot thick, dark yellowish orange, ferruginous, with minute selenite and biotite grains; bentonite at top is 0.03 foot thick, dark yellowish orange, with associated granular to powdery gypsum; FOSSILS - fish scales. 1.24 61