INDEX TO GEOLOGICAL HISTORY OF NEW YORK STATE 129 
Newark series, 62, 74 
Niagara Falls, recession, 115; and 
gorge, II2 
Niagara formation, 52 
Niagara river, 100 
Nipissing Great Lakes stage, 101 
North River, 42 
Olean conglomerate, 12 
Oneida lake, 27 
Oneida sandstone and conglomerate, 
12 Si, Beh Ge 
Onondaga limestone, 12, 56 
Ontario, Lake, 81, 96, I00 
Ontario basin, 26 
Ontario plain, 21, 55 
Ordovicic period, 44-47 
Oriskany sandstone, 12, 55, 56 
Oswego river, 27 
Oswego sandstone, 52 
Overwash plain, 04 
Paleo-geography, defined, 8 
Paleozoic history, 41-60 
Palisades of the Hudson, 25, 62 
Passaic basin, 28 
Pegmatite, 39 
Peneplain, 10 
Physiographic provinces, 15-28 
Physiography, defined, 8 
Piedmont plateau, 47, 48 
Piseco lake, 104 
Plateau province, 16 
Pliocene, 77 
Plutonic rocks, 8 
Portage shale and sandstone, 12, 56 
Potomac series, 65 
Potsdam sandstone and limestone, 
13, 41 
Potsdam sea, 42 
Precambric history, 29-40; late, 39- 
40 
Quaternary period, 87-117 
Raquette river, 26 
Relief features, development of, 78 
Rensselaer grit, 55 
Rochester shale, 12 
Rocky Mountain revolution, 68 
Rome river, 80, 82, 86 
Rondout creek, 79 
Rondout waterlime, 12, 54 
Rosendale cement region, 54, 60 
Sacandaga, Lake, 107 
Sacandaga river, 80, 86, I10 
Saginaw, Lake, 99 
St Lawrence river, 82, 86; channel 
submerged, 116 
St Lawrence valley, 26, 101 
St Lawrence valley province, 22 
Salina shales, 12, 54 
Salisbury, R. D., cited, 86 
Schroon Lake, 43, 104 
Scott, W. B., cited, 50 
Sedimentary rocks, 8; Grenville 
formation, 30 
Seneca lake, 103 
Seneca river, 27 
Shawangunk conglomerate, 12, 52, 
54 
Shawangunk mountain, 25, 52, 590 
Siluric period, 51-55 
Six Mile creek, 114 
Skunnemunk mountain, 55 
Southwestern plateau province, 16, 
55 
Spencer, J. W., cited, 82 
Stony Creek divide, 111 
Superior, Lake, 98 
Susquehanna river, 27, 79, 80, 84 
Syenite, 13, 34 
Taconic mountain revolution, 47-51 
Tarr, R. S., cited, 96, 103, 105 
Taughannock gorge, 114 
Terminal moraine, 93 
Tertiary period, 77-86; drainage in, 
81-86 
Theresa formation, 43 
Thousand Islands, 22, of 
Till, 94 
Time scale, It 
Topographic maps, construction and 
uses, I18 
