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This photo that dates
back to the early 1900's shows the Bluff covered in extensive drifts of
sand. In previous times when sea levels were much lower than at present,
large amounts of sand blew into dunes along this part of the Victorian
coast.
Over time shell fragments in the sand, dissolved by the action of rainwater
acting as a weak acid, released calcium carbonate into the soils and caused
the sand grains to be cemented together. This is one of the main materials
that is now found on the Bluff.
The rock type is sometimes called Aeolinite because it is largely made
of particles that have accumulated by the action of wind. It is also known
as dune limestone or Calcarenite because of the high proportion of Calcium
Carbonate in the rocks.
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