ApostlesAlong the southern coast of Victoria, Australia, sits Port Campbell National Park, home of t
ApostlesAlong the southern coast of Victoria, Australia, sits Port Campbell National Park, home of the fascinating sea stack formations known as the apostles (after some collapses, there are currently 8 of them).The rocks are limestones of the Port Campbell limestone, a fairly soft and layered limestone that is 15 to 20 million years old – deposited at a time when sea level was slightly higher than now and the area was submerged.As sea level has migrated up and down over the last few hundred thousand years, it occasionally paused at certain levels, leading to rapid scouring and erosion of the exposed layers. 15,000 years ago these limestones were far above sea level and eroding slowly. When the last glaciation ended, sea level rose and reached a level where the waves began pounding these layers, breaking them apart into the shapes found today over a fairly short time geologically.-JBBImage credit: https://www.flickr.com/photos/don2/69187336Read more:http://visit12apostles.com.au/natural-wonders/coastal-geology/http://parkweb.vic.gov.au/__data/assets/pdf_file/0020/313373/Port-Campbell-National-Park-and-Bay-of-Islands-Coastal-Park-Plan.pdf -- source link
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