the large monolithic mass of rock struck the sediments at bottom of gilbert inlet at the head of the bay with great force. the impact created a large crater and displaced and folded recent and tertiary deposits and sedimentary layers to an unknown depth. the displaced water and the displacement and folding of the sediments broke and uplifted 1, 300 feet of ice along the entire front face of the lituya glacier at the north end of gilbert inlet. photography 