ii8 



NEW YORK STATE MUSEUM 



Dicranograptus furcatus, 84. 

 Didyniograptus Sagittarius, 84. 

 Diorite, 15. 

 Diplograptus marcedus, 84. 



pristis, 84. 

 Drainage, 8, 105; preglacial, history 



of, 96-99. 

 Drumlins, 100. 



Dutchess county limestone, 61. 

 Dwight, W. B., mentioned, 10, 56, 63, 



65 ; cited, 48, 49, 56, 59, 60, 61, 62, 



112, 113, 114, 115. 



East Fishkill, T]. 



East Fishkill Hook, 13, 24, 43, 104. 

 Eaton, Amos, cited, no. 

 Echinoencrinites anatiformis, 62. 

 Economic geology, 106-10. 

 Emerson, B. K., mentioned, 39 ; cited, 



114, IIS- 

 Emmons, E., cited, 26, no, in. 

 Epidote, 27, 28. 



Erosion, 99-100; postglacial, 104-5. 

 Escharapora recta, 61. 



Fallkill creek, 8, 9, 105. 



Faults, 13; in the gneisses, 33; Wap- 

 pinger creek belt, 65-70 ; limestones, 

 within the Hudson River forma- 

 tion, 87-96. 



Feldspar, 16, 17, 18, 22,, 27, ^2. 



Fishkill creek, 8, 85, 98, 103, 104, 105. 



Fishkill Landing, 6. 



Fishkill limestone, 26, 34, 48, 70-82, 

 106, 109; peculiar lithic variations 

 within, 76. 



Fishkill mountains, 7, 9; kame de- 

 posits, 104; gneisses, 9, 11, 18-25; 

 gneisses, summary of microscopic 

 characters, 30-33. 



Fishkill village, "/"], 79, 99, 103. 



Fly mountain, 11. 



Ford, S. W., cited, 113. 



Fordham gneiss, ZT \ of New York 

 city, 36. 



Fossils, from quartzite and overlying 

 limestone, 44-46. 



Freedom Plains, 95, 100. 



Fruit grov/ing, 107. 



Gayhead, yj. 



Geologic work, previous, 10. 



Geology, general, 9. 



Georgian formation, 72. 



Gerard, W. R., cited, 112. 



Glacial geology, 99-100. 



Glenham, 79, 85, 104. 



Glenham belt, 11, 18, 25-27, ^,2), 34, 

 78. 



Gneisses, of the Fishkill mountains, 

 9, II, 18-25, 30-33; Precambric, 11; 

 petrography, 14-18; micaceous, 17; 

 eastern 24-25; inliers, 25; sum- 

 mary of microscopic characters, 

 30-33; faults in, Z2>', summary and 

 conclusions, 3S-36; relations to 

 quartzite, 47. 



Gordon, C. E., cited, 116. 



Grabau, A. W., map prepared under 

 direction of, 5; cited, 64, 115; men- 

 tioned, 89. 



Granite of Shenandoah mountain, 

 24. 



Graptolithus, see Amphigraptus. 



Gregory, H. E., cited, 115. 



Groveville, 25. 



Hall, James, mentioned, 10; cited, 



26, III, 112. 

 Hematite, 30, 109. 

 Highlands, 7, 36, 81, 99, 106. 

 Highlands gneiss, ZZ- 

 Hitchcock, E., cited, no, in. 

 Holopea, 60. 

 Honness spur, see Mount Honness 



spur. 

 Hook district, 23-24. 

 Hook spur, 14, 35, 43. 

 Hopewell, 9, 71, 74. 

 Hopewell Junction, 8, 80, 103. 

 Hornblende, 15, 16, 17, 22, 30, 31, 



^-2, 38, 39- 

 Hornblende gneisses, 16-17. 

 Hortontown, 24, 25, 2>^, 42, 47. 

 HortontOAA'-n basic eruptive rocks, 



37-39- 

 Hortontown hornblende, 11. 

 Hudson gorge, depth near Storm 



King, 7. 



