Sukakpak Mountain elev. 4,459 ft. Once an ancient seabed, this limestone deposit was subjected to intense heat and pressure causing it to be metamorphosed into marble. This massive marble rock was thrust up during the formation of the Brooks Range and is now one of its most recognizable peaks. Look for palsas around the base of the mountain. These oval shaped mounds are formed by ice beneath the soil. Palsas are low frost heaves that pop up in arctic and sub arctic regions. As the ice freezes and thaws, it pushes the ground up.