250 



NEW YORK STATE MUSEUM 



Halite, see Rock salt. 



Hall, James, statements quoted, HO 4 ; 



acknowledgement to, 111 5 ; geologic 



reports, 236 6 ; geologist, 241 8 ; curator 



ot museum, 244 1 . 

 Hamilton group, 1622-641, 1918-923; 



shale, 163 1 . 

 Haverstraw stone, 195 9 . 

 Helderberg rocks, ISffl-SW: 

 Hematite, 122 7 , 219 2 . 

 Highlands, formation, 124 5 , 139 2 , 139 6 , 



140 8 ; magnetic iron ores, 216 8 -18 5 . 

 Historic geology, 1263-27 9 . 

 Hornblende, 1215, 125 1 , 182*, 2049-5 1 . 

 Hornstone, 173 7 . 

 " Horses," 2173. 



Hudson river, carbonate ores, 221 9 -22 4 . 

 Hudson river Milestone, 192*. 

 Hudson river sandstone, 188*. 

 Hudsou river group, 149 3 -50 4 . 

 Hudson valley, clays, 210 6 -11 6 . 

 Hunt, T. S., quoted, 1176. 

 Hydraulic cement, 156 5 . 

 Hydromica schist, 126 1 . 

 Hypersthene, 122 2 , 1251- 



Ice age, 175 9 -77 2 . 



Igneous rocks, 123 2 , 124 1 -25 3 , constitu- 

 ents, 122^. 



Illuminating gas, 227 9 , 



Infusoria] earth, 226 s . 



Irou age, 179 7 . 



Iron ores, 214 4 -22 4 ; localities produc- 

 ing, 231 9 . 



Jefferson county, sandstone, 145 2 ; 

 Black river limestone, 148 6 ; hema- 

 tite, 219 2 . 



Jewett, Ezekiel, curator of museum, 

 243 6 ; resignation, 244 1 . 



Jurassic system, 1723-73 2 ; life of, 1726- 

 732. 



Kaolin deposits, 213 2 . 



Kaolinite, 120 7 . 



Kemp, J. F., Geology of Moriah and 



Westport townsidps, 214 6 . 

 Kittatiuny mountains, formation, 151 6 . 



Labradorite, 121 2 . 



Lake Champlain, iron ores, 218 6 -19 1 J 



Lake Mohonk, on Shawangunk grit, 



1518. 

 Lakes of central New York, 161 6 . 



Lapworth, , geologic studies, 146 5 . 



Laramie group, 174 4 . 



Laurentian rocks of Canada, 138 7 . 



Lead ore, 122 7 ; localities producing, 



2326. 



Lenticular iron ores, 219 8 . 



Lewis county, Potsdam sandstone 

 exposures, 145 1 ; Hudson river group, 

 1496. 



Lignite, localities producing, 235 4 . 



Lime and cement, 222 5 . 



Limestone, 125 7 , 127 5 , 196 9 -2033; con- 

 stituents, 121 9 , 194 9 -95 5 ; of Acadian 

 group, 1443; f Adirondack, 1428; 

 of Dutchess county, 143 2 ; of lower 

 Silurian system, 146 8 -49 3 ; Trentou 

 group, 147 5 ; of upper Helderberg 

 group, 158 9 -6CA; of upper Silurian 

 system, 1531-58 1 ; of Washington 

 county, 143 7 . See also Crystalline 

 limestone; Magnesian limestone; 

 Tully limestone; Upper Helderberg 

 limestone. 



Limonites, 220 7 -218. 



Liucklaeu, Ledyard, Guide to geology 

 of New York and to the state geological 

 cabinet, 1096-10 3 . 



Lithology, manual of, 120 9 . 



Littlefalls, Archaean rocks, 138 9 -39i; 

 pre-Cambrian rocks, 141 3 ; calciferous 

 sandrock, 147 1 . 



Long Island, terminal moraine, 176 6 , 

 2036. 



Long Island clays, 212 4 . 



Longmeadow sandstone, 195 6 . 



Lower Helderberg group, 157M58 1 . 



Lower Helderberg limestones, 201 5 . 



Lower Pentaraerus limestone, 157 7 . 



Lower Silurian system, 138 3 , 146*-50 7 ; 

 life of, 1505. 



Ludlow ville shale, 163 4 . 



