Devil's Tower, Wyoming, a prominent basalt (traprock) landscape feature Traprock (or basalt) mountains, ridges, (or just traps) are elevated landscape features made of trap rock, most often basalt. Basalt, due to its high quantity of iron, is a characteristically dark-colored rock that weathers to shades of red and purplish-red when exposed to the air. Basalt is the substance of many elevated topographic features worldwide (hills, mountains, ridges, rock formations, etc.). Landscape features composed of basalt may include: Because basalt has a tendency to fracture at abrupt angles, topographic features made of basalt often have a "postpile" appearance (Devil's Tower of Wyoming is a good example) . Basalt ridges make up hundreds of square miles of topographic features in the northwestern United States, from Wyoming to Oregon. Devil's Tower in Wyoming The ridges and cliffs of the Columbia River Gorge in Oregon and Washington (state) Basalt Mountain in Colorado, for which the town of Basalt, Colorado is named. The Metacomet Ridge of Connecticut and Massachusetts. The New Jersey Palisades and Watchung Mountains Parts of California's inner coastal range. Most of the Hawaiian Islands and their mountains are composed of basalt or similar volcanic rock. References Farnsworth, Elizabeth J. "Metacomet-Mattabesett Trail Natural Resource Assessment.", 2004. PDF file. Cited Nov. 20, 2007. Raymo, Chet and Maureen E. Written in Stone: A Geologic History of the Northeastern United States. Globe Pequot, Chester, Connecticut, 1989. Deccan Traps The Siberian Traps "Stratigraphy and Paleocology of the Deerfield Rift Basin (Triassic-Jurassic, Newark Supergroup), Massachusetts." Guidebook for Field Trips in the Connecticut Valley Region of Massachusetts and Adjacent States. vol. 2, 84th annual meeting, New England Intergollegiate Geological Conference, The Five Colleges. Amherst, Massachusetts. October 9-10-11, 1992: 488–535. Cited from the web, Dec. 1, 2007. NFS Columbia River Gorge NPS Devil's Tower
 Traprock (or basalt) mountains, ridges, (or just traps) are elevated landscape features made of trap rock, most often basalt. Basalt, due to its high quantity of iron, is a characteristically dark-colored rock that weathers to shades of red and purplish-red when exposed to the air. Basalt is the substance of many elevated topographic features worldwide (hills, mountains, ridges, rock formations, etc.). Landscape features composed of basalt may include: Because basalt has a tendency to fracture at abrupt angles, topographic features made of basalt often have a "postpile" appearance . Basalt ridges make up hundreds of square miles of topographic features in the northwestern United States, from Wyoming to Oregon. The ridges and cliffs of the Columbia River Gorge in Oregon and Washington (state) Basalt Mountain in Colorado, for which the town of Basalt, Colorado is named. The Metacomet Ridge of Connecticut and Massachusetts. The New Jersey Palisades and Watchung Mountains Parts of California's inner coastal range. Most of the Hawaiian Islands and their mountains are composed of basalt or similar volcanic rock. References Farnsworth, Elizabeth J. "Metacomet-Mattabesett Trail Natural Resource Assessment.", 2004. PDF file. Cited Nov. 20, 2007. Raymo, Chet and Maureen E. Written in Stone: A Geologic History of the Northeastern United States. Globe Pequot, Chester, Connecticut, 1989. Deccan Traps The Siberian Traps "Stratigraphy and Paleocology of the Deerfield Rift Basin (Triassic-Jurassic, Newark Supergroup), Massachusetts." Guidebook for Field Trips in the Connecticut Valley Region of Massachusetts and Adjacent States. vol. 2, 84th annual meeting, New England Intergollegiate Geological Conference, The Five Colleges. Amherst, Massachusetts. October 9-10-11, 1992: 488–535. Cited from the web, Dec. 1, 2007. NFS Columbia River Gorge 
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Devil's Tower, Wyoming, a prominent basalt (traprock) landscape feature
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(Devil's Tower of Wyoming is a good example)
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Devil's Tower in Wyoming
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NPS Devil's Tower