I30 NEW YORK STATE MUSEUM 
Trent river channel, 101 
Trenton Falls, chasm, 109 
Trenton limestone and shale, 13, 46, 
47 
Triassic period, 61-63, 74 
Tug Hill province, 21-22, 52, 60, 112 
Tully limestone, 12, 56, 57 
Utica shale, 13, 46 
Valley trains, 94 
Vernon red shale, 54 
Volcanic rocks, 8 
Vulcanism, Io 
Wallkill river, 79 
Wappinger limestone, 46 
Warren, Lake, 99 
Waterfalls, 107 
Watkins glen, 114 
Weathering, effects of, 10 
Wells, 42, 43 
West Canada creek, 80, 86, 109 
Westfield, 114 
Whetstone gulf, 112 
White mountains, 47, 48 
Whittlesey, Lake, 98 
Yosts, 21, 73 
