The Large Rocky beach could have been deposited by a large storm, but it has been sometime since t was depostied (note the lichen which has grown) This is an area where isostatic rebound has been occuring and is a likely contributor to the old "Storn" beach from being deposited. "isostatic compensation The adjustment of the lithosphere of the Earth to maintain equilibrium
among units of varying mass and density; excess mass above is balanced by a deficit of density below, and
vice versa. See also: depth of compensation; isostasy. Syn: isostatic adjustment. " Glossary of Geology Fifth Edition In this case the removal of the overburden - being the ice cap, is allowing the land to rebound.