278 



XEW YORK STATE MUSEUM 



Cedar Qiff, 103. 



Cement beds, 44. 



Cenozoic time, 64. 



Chadwick, Charles X., member of 

 Board of Water Supply, 13. 



Chonetes coronatus, 38. 

 mucronatus, 38. 



Chop drill, 26. 



Clapp, Sidney, assisian: engineer, 

 109. 



Clark, cited, 44. 



Qays, III. 



Coastal plain, 73. 



Cobleskill beds, 4^ 55, 126. 



CoeA-mans limestone, 43, 55, 126, 133. 



Cold Spring, 85, 163. 



Conglomerates, better qualit\- 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. 



Crosb}-, W. O., consulting geologist, 

 6, 19, 75; cited, 36. 



Cross sections, Rondout valley, 140. 



Croton aqueduct, stud}- of shaft 13 

 and vidnit}-, 209-14: comparison 

 of Br\-n 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 Xest, 100, 163. 



CrAstallines. south of the Highlands, 

 47, s6: older, 57. 



Dalmanella testudinaria, 46. 

 Dalmanites selenurus, 40. 

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

 Danskammer crossing. 8s, 97, I03- 

 Darton, mentioned, 46. 

 Davis, Carlton E., acknowledgments 

 to, 6: department engineer, 13. 



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

 199. 



Delancey and Clinton street section, 

 structural geologj', 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 quarr}-, 198. 



Division engineers, responsibility of, 

 21. 



Drift, kinds of, 33-3^1 gladal, 3^-3^, 

 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, li, 69, 77, 112, 128. 



Esopus di^-ision of Northern Aque- 

 duct Department, 125. 



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

 ness, 133. 



Esopus vallev, geologic cross section, 



78. 

 Esbpus 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 quarr}-, 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, 1S5, 

 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. 



