The area was covered in a warm, shallow ocean 30 million years ago and the result is a thick layer of limestone formed when the remains of tonnes of sea creatures and corals dropped to the ocean floor. It has been utilised as a building material, road surfacing material. It has eroded into beautiful coastlines, famous caves, sinkholes and lakes.
Mount Gambier Limestone (fossiliferous limestone) originated from extensive colonies of bryozoa (or lace coral) that flourished on an open-marine shelf, formed over 30 million years ago. Its composition consists of bryozoa, foraminifea and echinoid spines and plates.
|My sisters, Kaye and Anne, standing next to the|
house made with Mount Gambier stone.
The Continental Shelf, which acts like a fish highway as it runs in an east/west direction off Portland and Port MacDonnell; and, the cold-flowing Bonney upwelling that pushes along the ocean floor before coming to the surface on the Shelf line. It is here that the all-important krill and other microorganisms gather. This starts an unbelievable food chain sustaining the smallest creature up to the biggest mammal on the planet. [Fishing Monthly]
We should have allowed more time because there is a lot to see and do. We only scratched the surface. It was extremely windy when we were there and I think that's normal. Shipwrecks were normal as well. The coast was treacherous. I guess it still is.
|Cape Banks lighthouse|