Geology Reference
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Figure 12.15.
Sections of sea cave at Lidbergsgrottorna, northern Sweden.
Other forms are inherited from the adjacent land mass: they have been developed by processes
active in the terrestrial context, but have been exposed at the coast and by marine agencies. Thus,
granite corestones set in a matrix of grus are exposed in low cliffs west of Windmill Bay, near
Cape Willoughby, on the southeast coast of Kangaroo Island, and in front of the cliff, the beach
consists of granite corestones released from the regolith by wave erosion of the matrix ( Fig.
12.16a) . Some of the released corestones differ from their terrestrial counterparts in that, like
boulders in other lithologies exposed on high energy coasts, they are faceted, scalloped, polished
and fitted (Hills, 1970) as a result of grinding induced by powerful storm waves (Fig. 12.16b), but
otherwise they are comparable to any other corestone boulders. The boulders spread over the plat-
forms at Smooth Pool, on the west coast of Eyre Peninsula (Twidale, Bourne and Twidale, 1977
and see Fig. 12.17a) , and at various sites on the Galician Atlantic coast, are also released core-
stones, for remnants of a grussy matrix and regolith are preserved in places, and a few of the boul-
ders display flared sidewalls (Fig. 12.17b).
Again, literal and littoral inselbergs occur in coastal zones in several parts of the world. Some,
like those near Esperance in Western Australia and Rio de Janeiro, in southeastern Brazil, are
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