Wave Rock is a natural rock which is shaped like a breaking ocean wave.
A wall lies above Wave Rock and about halfway up Hyden Rock. It collects and funnels rainwater to a storage
dam. The wall and dam were constructed in December 1928 by the Public Works Department for the original settlers of East Karlgarin District.
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Hyden Rock is a granite inselberg,
which consists of three domes. The central and western domes are
separated by a deep valley, which is now occupied by a reservoir. The
central and eastern domes are linked by a low platform. A multistage
process of landform development created these domes. The initial step in
the development of Hyden Rock was the subsurface alteration by
weathering of granite bedrock beneath a lateritised land surface during the Cretaceous Period between 100–130 million years ago. Depending on the degree to which it was fractured by jointing,
the granite bedrock underlying this surface was altered to varying
depths beneath the land surface. This process formed underground "domes"
of solid granite bedrock surrounded by deeply weathered, relatively
loose, and disaggregated granite. Following separation of Australia and
Antarctica and accompanying tilting of what became southwestern
Australia, periodic erosion of the deeply weathered granite, which
underlaid the surrounding land surface, exposed these buried solid
bedrock domes over time as Hyden Rock.
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