Twelve Apostles, Great Ocean Road, Victoria, Australia for Water H2O ThursdayLimestone is a sedimentary rock. It forms in layers with the youngest rock closest to the surface. When you look at a cliff in this National Park you are looking at a vertical geological record of millions of years. Whilst the Port Campbell Limestone and the lower older calcareous clays (Gellibrand Marl) exposed in the lower layers range from 7 – 15 million years old, it is a common misconception that visitors are viewing an ancient seascape. Current research and bathymetry indicate that at the end of the last ice age (18 000 years ago) the regional coastline would have been 70km south west of where it is today. With the ocean currently acting on the softer grey Port Campbell limestone there is a constant undermining of the younger, more brittle, yellow Port Campbell limestone that sits above it. I really don't like this area as there are so many tourists stampeding on the board deck. However, I haven't visited this area for 20 years!
Thank you for dropping by. Have a great weekend!
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