Geological makeup of Table Mountain
From GeoClasses
Table Mountain consists of layers of quartzic sandstone and shale.
The sandstone (pictured below) is relatively hard because it consists of quartz. This explains why the sandstone does not erode very quickly. This sandstone was deposited on an already eroded surface of the granite basement group. It is this granite base that protects the sandstone structure from weathering as a result of constant exposure to the water of the sea. The sandstone is what makes up the uniquely shaped flat top and is also know as "Table Mountain Sandstone." The sandstone in the area is so unique that they are caves made completely of sandstone around Table Mountain even though most caves are made of limestone.
- Sandstone*
- Shale*
The shale (pictured below) is located below the sandstone and is relatively weak in response to weathering. This explains why it is very difficult to see the layers of shale.
- Quartz*
Quartz is another rock type that can be found around Table Mountain. Quartz is the second most common mineral in the Earth's continental crust. The Quartz that is around Table Mountain is layered in with the Sandstone and helps create the 'Table Mountain Sandstone'.
