Plates 1. The Connecticut Valley as it is seen from Mt. Sugarloaf Front. 2a. Air view of the ox-bow lake between Northampton and Mt. Tom 4 2b. Roches moutonnées of the Pelham Hills seen from Hadley 4 3a. Mt. Sugarloaf, a remnant of Triassic rocks disappearing grain by grain down the Connecticut River 12 3b. Mt. Monadnock, a hill surmounting the New England peneplain, seen from Mt. Lincoln 12 4a. A dinosaur walked from the raindrop marked surface at the right to a shallow pond at the left 22 4b. Volcanoes ejected much ash and many bombs to form the Granby tuff 22 5a. Columnar lava rests upon red sandstone in the cliffs at Greenfield 32 5b. Fissures were filled with liquid rock that became solid and bonded wall to wall at the Windsor Dam 32 6. View of the Holyoke Range from Mt. Lincoln 52 7a. View of the Deerfield River gorge emerging on valley lowland as seen from Mt. Sugarloaf 58 7b. View of the French King gorge as seen from the bridge 58 8a. View of Titan’s Piazza at Hockanum showing the columns resting upon the gently inclined sandstone 60 8b. View of the Springfield lowland from the Westfield Marble quarry 60 9a. The dinosaur track preserve at Smith’s Ferry near Holyoke 66 9b. Varved clays or calendar beds on river bank south of Hadley 66 10. View of the Deerfield gorge from the east summit of the Mohawk Trail 92 Figures