This sea arch was formed through erosion by frost and wave action.  The erosion was concentrated along a small fault which extends from the Bonavista Peninsula (between the two rock pillars in the foreground) through the island, creating the arch. 

The arch is developed in sandstone of the Prtecambrian Musgravetown Group strata.  Storm wave energy is concentrated on the eastern flank of Elliston Point. Here, sea spray and frost action have created 10 stacks along the cliff, as joints within the resistant conglomerate strata have been exploited.  Along the eastern side of the cove, energy levels are low and terrestrial sediment supply is minimal, and thus the rock platform remains exposed.

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