INDEX 



Appalachian mountain-folding. 63, 

 66, 7Z- 



Aqueduct, see Catskill aqueduct. 



Arden point, 97. 104. 



Arden point line, 85. 



Artesian flows, 142. 



Ashokan dam, construction of, 13 ; 

 elevation of reservoir, 17; stone 

 used in construction, 38; geologi- 

 cal features involved in selection of 

 site for, 109-16; location map, 113; 

 Olive Bridge preferable location, 

 116; to be finished first, 183. 



Aspidocrinus scutelliformis, 42. 



Athyris spiriferoides, 38. 



Atrypa reticularis, 40, 43. 

 spinosa, 40. 



Atwood, T. C, acknowledgments to. 

 7; division engineer, 2^7. 



Beaver Kill, no. 



Becraft limestone, 42, 55, 126. 



Bensel, John A., member of Board 

 of Water Supply, 13. 



Berkey, Charles P., consulting geolo- 

 gist, 6, 19, 75; cited, 48. 



Binnewater sandstone. 44, SS, 126, 

 133, 134, 140; porosity, 135. 



Bluestone, character and quality, 

 117-23; economic features, 119; 

 petrography, 119-23. 



Borings on the lower east side, tabu- 

 lations and interpretations, 254-65. 



Breakneck ridge, 85, 91-95, 100, 163 ; 

 quality and condition of rock, 106- 



Brink, Lawrence C, acknowledg- 

 ments to, 6; division engineer, 21, 

 149, 151. 



Bronx valley, geologic cross section, 

 193- 



Brown, Thomas C, employed on 

 Esopus division. 125; observatlcn 

 on limestone rocks, 140. 



Brush, William W., acknowledg- 

 ments to, 6; division engineer, 14, 

 21, 215. 



Bryn Mawr, geologic section at, 205 ; 

 comparison with shaft 13, 212. 



Bryn Mawr siphon, 201-S. 



Bull mountain, 163. 



Calyx drill, 26. 



Cambric quartzite, 102. 



Cambro-Ordovicic formations, 45-46, 

 56, 63. 



Carson. J. P., cited, 209. 



Cat Hill gneissoid granite, S^, 57- 



Catskill aqueduct, water supply pro- 

 ject, 9-16; generalities of construc- 

 tion, 14-15; estimation of cost, 15; 

 present plans for, 15; time for 

 completion. 15 ; problems en- 

 countered in the project, 17-24; 

 gathering data, 21-23 ', relative val- 

 ues of different sources of infor- 

 mation and stages of development, 

 25-28; geologic problems. 75-276; 

 general position of aqueduct line, 

 77-80; location map, 80. 



Catskill creek, 11. 



Catskill district, general geology, 29- 

 74: of simple structure, 31; post- 

 glacial faulting, 271-72. 



Catskill formation. 2>7, 55- ^3- 



Catskill Monadnock group, yz- 



Catskill supply, area in square miles, 

 11: daily supply in gallons, 11; 

 estimated daily supply, 11 ; esti- 

 mated cost, II : storage in gallons, 

 II ; part of supply available by 

 191 3, 15. 



Catskill system, parts of. 11-14; con- 

 struction of certain parts in ad- 

 vance of the rest, 13. 



Catskill watersheds and aqueduct, 

 map, 12. 



Caves, 137. 



