7. Chalky limestone, olive-gray to light-olive-gray weathering yellowish gray, medium-hard, tough, speckled; FOSSILS - Inoceramus cuvieri?, Collignoniceras woollgari . . . . . . . . . . . . . . . 0.5 6. Shaly chalk, like 8, weathering platy, one layer of closely spaced and two layers of widely spaced concretionary nodules of olive-gray chalky limestone; FOSSILS - Inoceramus latus?, gastropod mold. . . . . . . . . . . . . . . . . . . 6.0 5. Chalky limestone, weathered yellowish gray to dark yellowish orange, medium-hard, resistant, speckled, top 0.08 foot separated from main bed by seam of bentonitic? gypsum; FOSSILS - recrystallized baculitids? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.55 4. Gypsum, nearly white, iron-stained, granular, bentonitic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 3. Bentonite, nearly white, weathered dark yellowish orange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 2. Shaly chalk and chalky limestone; chalk like 8; limestone concretionary in three or four layers, olive-gray weathering yellowish gray, medium-hard, speckled, centers commonly iron stained, parallel to bedding; FOSSILS - Inoceramus labiatus, Collignoniceras woollgari, fish scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.9 Thickness of exposed part of Fairport Chalk Member . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.10 GREENHORN LIMESTONE Pfeifer Shale Member 1. Chalky limestone (top of Fencepost limestone bed), not measured. Description of Section Measured at STOP 4 CARLILE SHALE Blue Hill Shale Member 29. Shale, light-olive-gray weathering yellowish gray, silty, blocky, weathers flaky; FOSSILS - fish remains. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 28. Shale and concretions, shale similar to 29; concretions olive-gray weathering dark yellowish orange to grayish red, calcareous, septarian; FOSSILS - Collignoniceras hyatti, Inoceramus flaccidus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 27. Shale, light-olive-gray, very slightly silty, blocky to fissile, weathers flaky. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.7 26. Shale and concretions; shale light olive gray, slightly silty, weathers flaky; concretions olive-gray weathering grayish red, pale brown and dark yellowish orange, weakly calcareous, clay-ironstone type; FOSSILS - Inoceramus flaccidus?, Collignoniceras hyatti? (juvenile) Scaphites carlilensis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 25. Shale, dark-gray to light-olive-gray, weathering medium gray, very slightly silty, blocky to fissile, weathers flaky, jarosite-stained, much selenite; FOSSILS - Collignoniceras hyatti? (juvenile), Inoceramus sp. (juvenile), Yoldia sp., Inoceramus cuvieri? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.1 Thickness of exposed part of Blue Hill Shale Member . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46.2 Fairport Chalk Member 24. Calcareous shale, olive-gray weathering light olive gray, silty, soft, somewhat chalky in lower part, with small selenite crystals; FOSSILS - Inoceramus sp.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7 23. Marly chalk, olive-gray weathering light olive gray, silty, speckled, medium-hard, breaks blocky; silt in this and similar beds below is calcareous; FOSSILS - Inoceramus n. sp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 55