I work primarily in Mt Gambier Limestone. Here is a little information about it:
- It is a coralline limestone found in the south east of South Australia.
- It was formed over 30 million years ago, from deposits of lace coral, when the region was under the ocean.
- There are occasionally shells and fossils in the stone, although it is generally very consistent in texture making it suitable for carving.
- It is quarried for the building industry in the form of blocks called ashlars.
- The material is very soft, making it easy to carve, but despite this softness it lasts very well outside, particularly when coated with a sealer.