Long Durational Natural Phenomenon
EXISTENCE OF WAVE ROCK
Duration: 100–130 million years
Wave Rock is a natural rock formation that is shaped like a tall breaking ocean wave. It forms the north side of a solitary hill known as "Hyden Rock” and lies 296 kilometers (184 miles) east-southeast of Perth, Western Australia. Hyden Rock is a granite inselberg, consisting of three domes. Wave Rock is an example of what geomorphologists call a "flared slope,” or a concave-upward or inward bedrock surface that is typically found around the base of inselbergs and granitic boulders. Flared slopes are particularly well developed in granitic landforms of south-western and southern Australia.
Formations like Wave Rock are argued to have formed by the concentrated chemical weathering around the base of an inselberg by groundwater. This weathering produces a concave-upward or inward pocket of relatively loose and dislodged bedrock. When the land surface around an inselberg is lowered by erosion, the pocket of this bedrock is also removed to produce a flared slope.
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