. Annual report of the United States Geological Survey to the Secretary of the Interior . ek section). 42. Limestone ledges , 5 0 41. Limestone ledges containing requienias. The three layers above described form a slope to the top of the hill (or bluff) above the face proper of the bluff 1 0 40. Ledge of hard limestone, 10 inches above basal sheet Hint. The upper part of the ledge contains rather small nodular flints 15 0 39. Limestone weathering out and giving rise to a good deal of red clay, apparently representing the zone of calcitized fossils found in the high bluff above McGills Ford 6 6
. Annual report of the United States Geological Survey to the Secretary of the Interior . ek section). 42. Limestone ledges , 5 0 41. Limestone ledges containing requienias. The three layers above described form a slope to the top of the hill (or bluff) above the face proper of the bluff 1 0 40. Ledge of hard limestone, 10 inches above basal sheet Hint. The upper part of the ledge contains rather small nodular flints 15 0 39. Limestone weathering out and giving rise to a good deal of red clay, apparently representing the zone of calcitized fossils found in the high bluff above McGills Ford 6 6 38. Massive thick ledges of limestone, detail not exposed 23 8 37. Soft, white, arenaceous limestone 2 2 36. Soft, arenaceous limestone 3 10 35. Ledge of limestone, rather soft, emitting odor of petroleum 2 10 34. Chalky limestone, forming little caves, composed of a good many small ledges; discoidal flints at top (just level with top of dam) 4 0 1 Same bed as No. 43, section 25 b. 2 Same bed as No. 29, section 25 b. U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART VII PL. XXX. FLINT FROM THE EDWARDS LIMESTONE. UI-NOJS hill.] BARTON CREEK SECTION. 233 Ft. In. 33. Hard limestone, emitting odor of petroleum under blows of of limestone rather meal}. Nodular flints, occasional dis- coidal flints in top 2 1 32. Two thin ledges of limestone; layer of sheet flint in top 1 2 31. Ledge of thick, massive limestone 5 0 30. Hard, yellowish limestone 2 0 29. Hard, thick, massive ledge of siliceous limestone, ringing under blows ofhammer. At the base there is a layer about 9 inches thick of opales-cent, pinkish, or browish flint. Apparently the limestone is beingconverted into flint by replacement, and the process has not yet been completed (S 0 28. Soft, chalky limestone, dissolving and forming small caves 3 0 27. Soft, chalky limestone with very large (may be 1 foot long), irregularly shaped blue flints at top 2 3 26. White chalky limestone, apparently siliceous; zon
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