Pinnacles Formation

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The Pinnacles, hundreds of large Limestone figures that lay on a sand dune above a beach in Namurg National Park, in Western Australia. A 2.5 hour long drive from the capital, Perth. The sandy beach lays on the coast of the Indian Ocean. Some of the structures stand up to 4 meters tall! It is fascinating they way they formed, what contributed to it's current shape, and how these forms may look like 100 years into the future.

Question 1
The formation of these structures are rather similiar to that of any normal limestone rocks. These limestone rock structures are sedimentary rocks, meaning that they are layered from loads of sediments or small parts of broken-off rocks. Limestone makes 10% of the world's totals sedimentary rocks. Limestone …show more content…
But how did they get this shape, the answer-Weathering. There are three types of weathering, Mechanical, Biological, and Chemical. The weathering of the Pinnacles uses all three of these weathering types. Human impact is also a major factor of the weathering of these limestone figures.
To determine how the Pinnacles are in the current shape, we have to go back the formation of them. The first type of weathering that contributed to their shape is biological. After the calcrete layer had set, tree roots had broken the layer and cracked it. The roots grew through the calcrete layer and shaped the limestone inside, allowing sand to cover the stone.
Once the sand blew off, the stone was open to the elements. As the rocks are right onto the open ocean, winds are quite strong coming off the waves, biting at the rocks. Sand blowing off of the back of the dune hits the formations at the back of the group, rubbing away particles of stone like sandpaper. On high tide the water runs up to the bottom of the front structures, erodeing them, this pulls particles of limestone out to sea with to rest inthe ocean floor, to create limestone …show more content…
As yet, there has been no limits or restrictions on touching or handlind the rock. A component of chemical weathering is the fact that oils from the human hands are left on the stone after touching the rocks. Constant rubbing, touching, & feeling the rocks will slowly erode the particles away leaving smaller structures.
Limestone is a softer rock as it measures 3-4 on the Moh's scale. It shares this spot with flourite & calcite. This means that it only takes a wire nail to scratch and erode limestone. This means that the coastal wind can reach capable speeds to blow sand grains hard enought to have damage onto the limestone. Erosion is evident at the feet of The Pinnacles as they shape inward proving the sand and water weathering. Human impact is not as evident, but will be noticable in years to come, as it will take a longer time to weather because human activity on the rock is not as harsh and constant onto specific
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