. Smithsonian miscellaneous collections. lrflSP S40. ?OStM&tiL, GENERAL MEETING. 71 18. A bed of clean, white, sharp sand, about 2 thick. (These last nine feet were difficult to work. The material could not beshovelled, and was too sandy to pump.) 19. A layer of red sand about V thick, containing on one side of the shaft a clayey sediment with lignite, and on the other aferruginous conglomerate. 20. 5 of blue-black, hard clay, running into a sandy sediment, and this, in turn, into the next stratum. 21. of clean, white sand. 22. 2 of dark green, compacted sand, containing pebbles and lignit
. Smithsonian miscellaneous collections. lrflSP S40. ?OStM&tiL, GENERAL MEETING. 71 18. A bed of clean, white, sharp sand, about 2 thick. (These last nine feet were difficult to work. The material could not beshovelled, and was too sandy to pump.) 19. A layer of red sand about V thick, containing on one side of the shaft a clayey sediment with lignite, and on the other aferruginous conglomerate. 20. 5 of blue-black, hard clay, running into a sandy sediment, and this, in turn, into the next stratum. 21. of clean, white sand. 22. 2 of dark green, compacted sand, containing pebbles and lignite. 23. of fine, sharp sand, almost apple-green in color. Beneath this lay the irregular surface of No. 24. 24. Dark, coarse-grained, soft, chloritic rock. This rock could be easily removed by the pick to a depth of three feet, whereblasting was begun at about twenty-six feet above meantide. The rock grew harder as the depth increased for aboutten feet, when it became a chloritic gneiss, and in generalremained of that nature through about
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
