482 [Assembly 
Erratic blocks, 388 
Eupyrchroite, 107 
Fireclay, 303 
Fine grained ore, Mclntyre, 292 
Flagging stones, 231 
Fucoidal layers, 369 
Fucoides caudi-galli, 377 
Frankfort slate, 363, 372 
Gardeau group, , 391, 430 
Genesee county, „ 424 
Geodiferous limestone, 53 
Gypsum, 69, 425 
Hardpan, 459 
Hamilton group, ^ 380 
Helderberg group, » 212, 236 
Hematite, 360 
Horsford's, E. N., assistant's report from the 4th dist 457 
Hudson river slate group, 212, 256 
Hydraulic cement, 239 
Hydraulic limestone, „ 416, 417, 426 
Inland sea, 432 
Ischua sandstone, 466 
Ithaca group, , . 381 
Johnson's, W. R. report upon Mclntyre iron, extract, 305 
Manganese, » 463 
Marcellus shales, 379 
Materials for construction, 387 
Manlius water lime group, 376 
Magnetic iron ore, 83, 274, 318, 358 
Marl, 461 
Medina sandstone, 874 
Minerals,.-- 107 
Mineral springs, 235 
Mines, 248 
Mica slate, 52 
Mineralogy of the different counties, 54 
Mohawk hmestone, 363, 370 
Montrose sandstone, „ 381 
Moscow shales, 379, 430 
Mt. Marcy, 336 
Mclntyre village, 295 
Natural bridge, , — 362 
Nitrogen gas, Canoga, 99 
