 Mount Jackson and the Welch Mountains <unk> the central Black Coast , which is dissected by many inlets and is bounded on the west by <unk> Plateau of central Palmer Land . The two mountains rise above the ice shelf with reliefs of about 1 @,@ 200 – 1 @,@ 500 metres ( 3 @,@ 900 – 4 @,@ 900 ft ) towards the east . They are interconnected by <unk> zones forming a plateau with steep snow slopes . Mount Jackson rises from its southeast flanks , displaying a steeple summit , while the north flank is occupied by a vast <unk> . <unk> moraines on the mountain 's east side measure between 1 – 5 kilometres ( 0 @.@ 62 – 3 @.@ 11 mi ) in length and display boulders at their distal ends . 
