We have made this Earth Cache a quick and easy one, we figure if you have come all this way to the westernmost edge of the Australian mainland you wont want to be worrying too much about technical Earth Cache answers!
Please be vey careful in the area and keep dare devil husbands and curious children on a short tethers! We were amused at how relaxed it is out here, down in Victoria we would have been required to park 1.5km away , then required to walk along a designated path to a platform constructed out of the strongest safety barrier known to man surrounded by many safety signs!
Welcome to the False Bay Blowhole, an interesting and scenic spot along the Zuytdorp Cliffs.
As we have mentioned in our other Earth Caches in the area the Zuytdorp Cliffs are comprised of Tamala Limestone, they formed 5-10,000 years ago when the Earth crust shifted along a fault line during an earthquake which shifted the rock up to 200meters high. Chemical and mechanical weathering continue to shape the landscape which brings s to what we are looking at here.
In geology, a blowhole is formed as sea caves grow landwards and upwards into vertical shafts and expose themselves towards the surface, which can result in blasts of water from the top of the blowhole if the geometry of the cave and blowhole and state of the weather are appropriate.
Blowholes are likely to occur in areas where there are crevices, such as lava tubes, in rock along the coast. These areas are often located along fault lines and on islands. As powerful waves hit the coast, water rushes into these crevices and bursts out in a high pressured release.
Blowholes have the capacity to change the topography near their locations. Blowholes can eventually erode the area surrounding the crevices to form larger sea caves. In some instances, the cave itself may collapse. This event may create shallow pools along the coast.
We have included the Department of Parks and Wildlife signage in our page as it is specific to the area and explains how this particular Blowhole works.
To log this Earth Cache we require you to visit GZ and WP2 to make some observations, consider the information given, then message us with the following answers to the best of your ability;
1. Is there any blow, what is coming up?
2. Has this hole been created from the ground down or the sea up?
3. A photo of your team or GPS at the location, upload as many photos as you like! (Optional)You are welcome to log your answers straight away to keep your TB's and Stats in order but please message us with your answers within 1 week. Cachers who do not fulfil the Earth Cache requirement will have their logs deleted without notice.
Source: Wikipedia, Department of Parks and Wildlife
