22. Shaly chalk, olive-gray weathering light olive gray, soft, laminated, speckled, less chalky in uppermost part, with very thin lenses of skele- tal limestone in upper half; bentonite? is 0.01 foot thick, nearly white, hard; FOSSILS - Collignonicer as woollgari, Inoceramus latus, I. cuvieri, Serpula tenuicarinata, Ostrea congesta . . . . . . . . . . . . . 16.9 21. Marly chalk, like 23; FOSSILS - Inoceramus sp. . . . . . . . . . . . . . . . . . . . . . 0.55 20. Shaly chalk, olive-gray weathering medium gray, tough, laminated, speckled, much calcareous silt in uppermost part, with ferruginous zone 0.05-foot thick lying 0.2 foot below top; bentonite is 0.05 foot thick, nearly white, weathering dark yellowish orange; FOSSILS - Collignonicer as woollgari, Inoceramus cuvieri . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7 19. Marly chalk, olive-gray weathering light olive gray, silty, soft, tough, speckled; silt is calcareous; FOSSILS - Inoceramus sp. . . . . . . . . . . . . . . . . . 0.3 18. Shaly chalk, olive-gray weathering medium gray, tough, laminated, speckled; bentonite is 0.1 foot thick, nearly white weathering dark yellowish orange; FOSSILS - Inoceramus sp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 17. Marly chalk, similar to 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15 16. Shaly chalk, like 18; FOSSILS - Ostrea congesta, Inoceramus latus, Ino- ceramus cuvieri? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 15. Marly chalk, similar to 19; FOSSILS - Inoceramus cuvieri? . . . . . . . . . . . . . . 0.3 14. Shaly chalk, dark-gray weathering medium light gray, tough, laminated, speckled; bentonite is 0.1 foot thick, nearly white, weathering dark yellowish orange to grayish yellow; FOSSILS - Ostrea congesta, Inoceramus latus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 13. Marly chalk, similar to 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15 12. Shaly chalk, olive-gray, tough, laminated, speckled, with very thin seam of dark-yellowish-orange bentonite at top; FOSSILS - Serpula tenuicarinata, Inoceramus cuvieri, Actinocamax manitobensis, Stramentum n. sp., Inoceramus sp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 11. Marly chalk, like 19, thin-bedded; FOSSILS - Inoceramus sp. . . . . . . . . . . . . 0.3 10. Shaly chalk, like 14, hard where fresh, much calcareous silt in uppermost beds; three very thin seams of bentonite, mostly weathered dark yellowish orange to grayish yellow; FOSSILS - Inoceramus cuvieri, Inoceramus latus, Collignonicer as woollgari . . . . . . . . . . . . . . . . . . . . . 5.0 9. Marly chalk, like 19; FOSSILS - Inoceramus cuvieri, Stramentum n. sp. . . . . . . . . 0.7 8. Shaly chalk, like 14, with much calcareous silt; FOSSILS - Inoceramus cuvieri, Inoceramus sp., Stramentum n. sp. . . . . . . . . . . . . . . . . . . . 1.2 7. Marly chalk, like 11, with sparse marcasite nodules; FOSSILS - Inoceramus cuvieri, Ostrea congesta . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.45 6. Shaly chalk, like 14, much jointed; FOSSILS - Ostrea congesta, Inoceramus cuvieri, I. latus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.9 5. Marly chalk, light-olive-gray, soft, tough, speckled; FOSSILS - Inoceramus cuvieri . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 4. Bentonite, yellowish-gray weathering dark yellowish orange. . . . . . . . . . . . 0.15 3. Shaly chalk, like 14; FOSSILS - Ostrea congesta . . . . . . . . . . . . . . . . . . 0.15 2. Bentonite, nearly white weathering dark yellowish orange. . . . . . . . . . . . . 0.05 1. Shaly chalk, like 14; FOSSILS - Ostrea congesta . . . . . . . . . . . . . . . . . 2.2 Thickness of exposed part of Fairport Chalk Member . . . . . . . . . . . . . . . . . 58.7 Total thickness of measured section . . . . . . . . . . . . . . . . . . . . . . . . 104.9 56