Isolated hill or range of hills standing above the general level of a peneplain and resulting from the erosion of the surrounding terrain. It may be located on relatively resistant rock or in a watershed position where erosion is least. It is named after Mount Monadnock, New Hampshire, USA.
Geography
An isolated peak, the relict of long-term subaerial denudation, now standing above the peneplain. The term comes from Mount Monadnock, New England; see Fowler-Billings (1949) GSA Bull. 60, 8.