Washing over coquina
by Jessica Brown
Title
Washing over coquina
Artist
Jessica Brown
Medium
Photograph - Photography
Description
Along the beach can be found a most unique rock outcrop. These rocks are believed to be formed from either a submerged offshore bar or from a beach ridge similar to the present barrier beach at Washington Oaks.
It is believed that the offshore bar was formed approximately 100,000 years ago during the last interglacial period of the Ice Age. At that time, sea level was about 25 to 30 feet higher than at present. When the sea level dropped during the following glacial period, the bar was exposed to air and weather. Rain water percolating down through the layer of sediment, dissolved calcium carbonate from the shell material, forming a matrix or cement, binding the loose sediment into coquina rock.
Once raised from the ocean, the bar stood above sea level for many thousands of years. It was not until about 5,000 years ago that the rising sea would have started wearing away the rock to produce the beautiful formation we see today.
Source:http://www.abfla.com/parks/WashingtonOaks/washingtonoaks.html
Uploaded
April 7th, 2013
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