Cave formed by the wave action of the sea and located along present or former coastlines
Sea cave formation along a fault on Santa Cruz Island, California, United States
A sea cave, also known as a littoral cave, is a type of cave formed primarily by the wave action of the sea. The primary process involved is erosion. Sea caves are found throughout the world, actively forming along present coastlines and as relict sea caves on former coastlines. Some of the largest wave-cut caves in the world are found on the coast of Norway, but are now 100 feet or more above present sea level.[1] These would still be classified as littoral caves. By contrast, in places like Thailand's Phang Nga Bay, solutionally formed caves in limestone have been flooded by the rising sea and are now subject to littoral erosion, representing a new phase of their enlargement.
Some of the best-known sea caves are European. Fingal's Cave, on the island of Staffa in Scotland, is a spacious cave some 70 m long, formed in columnar basalt. The Blue Grotto of Capri, although smaller, is famous for the apparent luminescent quality of its water, imparted by light passing through underwater openings. The Romans built a stairway in its rear and a now-collapsed tunnel to the surface. The Greek islands are also noted for the variety and beauty of their sea caves. Numerous sea caves have been surveyed in England, Scotland, and in France, particularly on the Normandy coast. Until 2013, the largest known sea caves were found along the west coast of the United States, the Hawaiian islands, and the Shetland Islands. In 2013 the discovery and survey of the world's largest sea cave was announced.[2] Matainaka Cave – located on the Otago coast of New Zealand's South Island – has proven to be the world's most extensive at 1.5 km in length. Also in 2013, Crossley reported a newly surveyed complex reaching just over a kilometer in survey at Bethells Beach on New Zealand's North Island.[3]
^Sjöberg, Rabbe (1988). "Coastal Caves Indicating Preglacial Morphology in Norway". Cave Science, the Transactions of the British Cave Research Association. 15 (3): 99–103.
^Barth, N (October 2013). "Caversham Caves, New Zealand: Breaking the Sea Cave Paradigm". NSS News. 71 (10): 4–14.
^Crossley, P. (December 2013). "Bethells Beach Sea Caves". Tomo Times (Journal of the New Zealand Speleological Society). 190: 8.
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