Sentence Examples


  • But in the derivant valley peneplains developed in the present cycle of denudation, and there are residual summits also; in the Connecticut Valley trap ridges, of which Mt Tom and Mt Holyoke are the best examples; at Mt Holyoke, lava necks; occasionally in the lowlands, ridges of resistant sandstone, like Deerfield Mountain near Northampton; in the Berkshire Valley, summits of resistant schists, like Greylock, the highest summit in the state.
  • Into fragments by processes of denudation, until it is hardly recognizable as a distinct range at all.
  • Of these the most notable is the Niagara escarpment which extends eastward from Canada, past Lewiston and Lockport, - a downward step from the Erie to the Ontario plain, where the Niagara limestone outcrops, and its resistance to denudation accounts for the steeply rising face at the boundary between the two plains.
  • As a rule the crests of the ranges are worn down by aerial denudation and have the general appearance of rounded domes.
  • Denudation in earliest Eocene times has produced flint gravels above the chalk, and an ancient stream deposit of chalk pebbles occurs at Ballycastle.