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The Okefenokee was formed over the past 6,500 years by the accumulation of peat in a shallow basin on the edge of an ancient Atlantic coastal terrace, the geological relic of a Pleistocene estuary. The swamp is bordered by Trail Ridge, a strip of elevated land believed to have formed as coastal dunes or an offshore barrier island.
A large dune complex is called a dune field, [7] while broad, flat regions covered with wind-swept sand or dunes, with little or no vegetation, are called ergs or sand seas. [ 8 ] [ 9 ] [ 10 ] Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have ...
a dune advances up a pre-existing slope, which is then eroded to form a cliff; a dune forms during a period of high sea level, then sea level drops, exposing a cliff face. They are most often seen as coastal landforms, but can also occur along lakes and rivers, and in deserts.
The concerned group in Salisbury Beach pooled together about $560,000, which they paid for out of pocket, and trucked in over 14,000 tons of sand to build a protective dune around several of the ...
They are located at the top of the backshore. The dunes will display characteristics of typical aeolian wind-blown dunes. The difference is that dunes on a barrier island typically contain coastal vegetation roots and marine bioturbation. Lagoon and tidal flats. The lagoon and tidal flat area is located behind the dune and backshore area. Here ...
Early pioneers in the Ohio Valley were already known as buckeyes when Dr. Daniel Drake, a physician and historian in Cincinnati, presented a speech on Dec. 26, 1833, extolling the virtues of the ...
The removal of sediment from the beach berm and dune thus decreases the beach profile. If storms coincide with unusually high tides, or with a freak wave event such as a tidal surge or tsunami which causes significant coastal flooding, substantial quantities of material may be eroded from the coastal plain or dunes behind the berm by receding ...
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