Shorelines and Submarine Shelves, Oahu, Hawaii
Citations Over Time
Abstract
Fourteen subaerial shorelines and five submarine shelves were previously recognized on and around Oahu, Hawaii. Field evidence and morphometric analyses show that the only three shorelines above present sea level are the Hanauma at 10-15 feet, Waimanalo at 25 feet, and Kaena at 95 feet. Bathymetric data indicates two major submarine shelves. The uppermost is the Mamala shelf at a depth of 350 feet. Two minor platforms are superposed on the Mamala shelf at depths of 40 and 160 feet. These three members are not deformed but are essentially level around the island. The lowermost is the Lualualei submarine shelf, ranging in depth from 800 to 2,400 feet and possibly tectonically warped and tilted around the island. Fauna from the Lualualei shelf indicate a Miocene age. The three subaerial shorelines and Mamala shelf probably resulted from glacio-eustatic sea-level changes of the Pleistocene.
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