46. Chalky limestone, olive-gray, weathering grayish orange, speckled, resistant, very even bedding surfaces; FOSSILS - Inoceramus labiatus.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 45. Shaly chalk and chalky limestone; chalk like that in 47 with very thin lenses of skeletal limestone in upper 1 foot; limestone occurs in five nodular layers, olive-black (fresh) to pale-grayish-orange (weathered), with abundant whole and fragmentary Inoceramus, limonite commonly stains centers of limestone bodies, nodules in layer near center of unit laminated in lower part; FOSSILS - Inoceramus labiatus, Hedbergella . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 Total thickness of Pfeifer Shale Member . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.3 Jetmore Chalk Member 44. Chalky limestone, weathered yellowish gray, resistant, speckled, limonite- stained; FOSSILS - Inoceramus labiatus, smooth baculitid molds, arthro- pod burrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.15 43. Shaly chalk and chalky limestone; chalk like that in 47, with very thin lenses of hard skeletal limestone in lower part; nodular limestone layer pale olive gray weathering pale grayish orange, with many Inocera- mus fragments; limestone bed pale olive to pale grayish orange, mostly Speckled, partly dense hard rock; FOSSILS - Inoceramus labiatus, fish remains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.95 42. Limestone and shaly chalk; limestone dark olive gray weathering pale grayish yellow to pale grayish orange, hard, brittle, slight petro- liberous odor, resistant, with abundant whole Inoceramus labiatus, local concentrations of shell debris, and with sparse burrow structures; similar to that in 47, with abundant shells of I. labiatus and lenses of skeletal limestone; FOSSILS - I. labiatus, smooth baculitid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 41. Shaly chalk and chalky limestone; chalk olive black weathering light olive gray, tough, laminated, speckled, chalk in upper 2 to 3 feet crowded with shells of Inoceramus and very thin lenses of skeletal limestone; limestone dark olive gray, mostly weathered very pale orange or pale grayish orange, mostly hard, resistant, most beds extensively burrow-mottled, limonite stains mark centers of most beds; FOSSILS - Watinoceras reesidei, Inoceramus labiatus, fish remains, burrow structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.5 Total thickness of Jetmore Chalk Member . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.8 Hartland Shale Member 40. Shaly chalk, olive-black, tough, laminated, speckled, with numerous harder nonlaminated, burrow-mottled layers; FOSSILS - Inoceramus pictus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3 39. Bentonite, nearly white, weathering dark yellowish orange, biotic, slightly silty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 38. Shaly chalk, like that in 40; FOSSILS - Inoceramus pictus?, fish re- mains, burrow structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.8 37. Chalk, olive-gray, extensively burrowed, especially at base; FOSSILS - fish remains, Inoceramus pictus, burrow structures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 36. Shaly chalk, olive-black, tough, laminated, well-jointed, with very thin lenses of hard skeletal limestone and one lensing chalk layer; FOSSILS - Inoceramus pictus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6 35. Chalky limestone, olive-gray, relatively hard, speckled; FOSSILS - Inoceramus pictus, smooth baculitid molds, Pteria sp., Kanabiceras kanabense, Sciponoceras gracile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2-0.6 34. Shaly chalk, olive-black, tough, laminated, speckled; bentonite,0.3- foot-thick, light-brownish-gray to dark-yellowish-orange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6-2.0 33. Chalk, light-olive-gray to medium-gray, relatively hard, tough, much burrowed, sparse pyrite in burrows; FOSSILS - burrow structures, Inoceramus pictus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 51