. Bulletin of the Geological Society of America. Geology. DETAILED STUDY OF SECTIONS 173 under the shoe. . The rock is the ordinary gneiss found on Manhattan island with a dip almost ;* Russell states, on the authority of information furnished by the depart- ment of docks, that the borings for foundations of the New York tower, made September 10 to 23, 1877, were carried to a depth of feet, i. Figure 18.— Section across East River. Along line of East River bridge number 3. and penetrated mica schist to a depth of feet. He quotes Mr F. Col- lingwood, chief engineer, as f
. Bulletin of the Geological Society of America. Geology. DETAILED STUDY OF SECTIONS 173 under the shoe. . The rock is the ordinary gneiss found on Manhattan island with a dip almost ;* Russell states, on the authority of information furnished by the depart- ment of docks, that the borings for foundations of the New York tower, made September 10 to 23, 1877, were carried to a depth of feet, i. Figure 18.— Section across East River. Along line of East River bridge number 3. and penetrated mica schist to a depth of feet. He quotes Mr F. Col- lingwood, chief engineer, as follows: " The rock on which the pier foundations rest is gneiss, with a very irregular surface; in a place 172 by 100 feet the depth below high tide varied from 75 to 94 feet. The caisson was stopped at 78 ; I i oGn. -1/9 -*H-r I -/33 I I I oGne/ss l l l 1 ^Limestone l oG/7. -/O0 \oGn Gn. n ^L Figure 19.—Location of Drill Holes under New York Toiver of East River Bridge Number 3. At the Brooklyn tower mica schist was found at a depth of 88 Coentles reef.—This reef of gneiss is located in the East River channel about one-third of the distance from the Battery to Joralemon street, in ?Reports of Executive Committee, Chief Engineer, and General Superintendent of the New York Bridge Company, Brooklyn, 1872, p. 26. t Russell, quoting F. Collingwood, loc. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
