Mt. Colden’s Trap Dike is a well-known feature among hikers, climbers and geologists. It is not, however, the only trap dike in the High Peaks. Take notice and you’ll find smaller dikes crisscrossing most of the slides and treeless summits. Most of these are interesting and perhaps photogenic, but irrelevant to climbing.
One of the best-kept backcountry secrets is a large vertical trap dike capped with a diagonal car-sized capstone on Mt. Marcy. It lies in a northeastern facing cliff deep in Panther Gorge and looks like a pencil-thin shadow from the summit of Mt. Haystack. This is Marcy’s Great Chimney. » Continue Reading.