Outer Bank
Published on Nov 30, 2015
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PRESENTATION OUTLINE
The current theory is that barrier islands were formed about 18,000 years ago when the last Ice Age ended.
Photo by ukespresso
As the glaciers melted and receded, the sea levels began to rise, and flooded areas behind the beach ridges at that time.
Photo by Stuck in Customs
The rising waters carried sediments from those beach ridges and deposited them along shallow areas just off the new coast lines. Waves and currents continued to bring in sediments that built up, forming the barrier islands. In addition, rivers washed sediments from the mainland that settled behind the islands and helped build them up.
Photo by Geoff Livingston
