﻿-/' 



NEW YORK STATE MUSEUM 



Cedar Cliff, 103. 



Cement beds, 44. 



Cenozoic time, 64. 



Chadwick, Charles N., member of 

 Board of Water Supply, 13. 



Chonetes coronatus, 38. 

 mucronatus, 38. 



Chop drill, 26. 



Clapp, Sidney, assistant engineer, 

 109. 



Clark, cited, 44. 



Clays, in. 



Coastal plain, 73. 



Cobleskill beds, 44, 55, 126. 



Coeymans limestone, 43, 55, 126, 133. 



Cold Spring, 85, 163. 



Conglomerates, better quality of wall 

 than limestones, 140. 



Continental elevation, 67-69. 



Cortlandt series of gabbro-diorites, 

 52, 53, 57- 



Coxing kill, 127, 128. 



Coxing kill section, 135-36; struc- 

 tural geologic detail, 136. 



Cretaceous deposits, 36-37, 54. 



Cretaceous peneplain, 67. 



Cronomer hill, 154. 



Crosby, W. O., consulting geologist, 

 6, 19, 75 5 cited, 36. 



Cross sections, Rondout valley, 140. 



Croton aqueduct, study of shaft 13 

 and vicinity, 209-14 ; comparison 

 of Bryn Mawr and shaft 13, 212- 

 14; map showing location, 239. 



Croton lake crossing, 183-89. 



Croton river, average daily flow, 9. 



Croton water, average daily consump- 

 tion, 9. 



Crows Nest, 100, 163. 



Crystallines, south of the Highlands, 

 47, 56; older, 57. 



Dalmanella testudinaria, 46. 

 Dalmanites selenurus, 40. 

 Dana, J. D., cited, 48; mentioned, 46. 

 Danskammer crossing, 85, 97, 103. 

 Darton, mentioned, 46. 

 Davis, Carlton E., acknowledgments 

 to, 6; department engineer, 13. 



Davis, J. L., tests of Kensico rocks, 

 199. 



Delancey and Clinton street section, 

 structural geology, 253-66. 



Delivery conduits, geological condi- 

 tions affecting the location of con- 

 duits, 215-29. 



Devonic strata, 37~43, 55- 



Diabase, 37, 240. 



Diamond drill, 26. 



Dikes, 106; pegmatite, 52. 



Dinnan quarry, 198. 



Division engineers, responsibility of, 

 21. 



Drift, kinds of, 33-36; glacial, 32-36, 

 .54, 100, 202. 



Dwight, mentioned, 46. 



East river crossing, 233, 238. 



East river section, 250-53 ; structure, 

 233. 



Engineers, division, responsibility of, 

 21. 



Esopus creek, 11, 69, 77, 112, 128. 



Esopus division of Northern Aque- 

 duct Department, 125. 



Esopus shale, 40, 55, 126, 140; thick- 

 ness, 133. 



Esopus valley, geologic cross section, 

 78. 



Esopus watershed, development of, 



13, 15. 

 Exploration zones, special, 237-70. 



Fault zones, 266. 



Faults, 60-62, 135, 163 ; postglacial, 

 general question of, 271-76. 



Favosites helderbergia, 43. 



Ferris quarry, 198. 



Firth Cliff e, 153. 



Flinn, Alfred D., acknowledgments 

 to, 6; department engineer, 13, 215. 



Folds, 59-60, 272. 



Fordham gneiss, 47, 52, 57, 62, 185, 

 191, 192, 202, 206, 217, 218, 219, 

 220, 221, 225, 226, 232, 233, 234, 

 237, 238, 255, 257, 258, 260, 261, 

 262, 264, 265, 266, 268. 





