Submerged Shorelines and Shelves in the Hawaiian Islands and a Revision of Some of the Eustatic Emerged Shorelines
HAROLD T. STEARNS Hawaii Institute of Geophysics, University of Hawaii, 2525 Correa Road, Honolulu, Hawaii 96822 Submerged Shorelines and Shelves in the Hawaiian Islands and a Revision of Some of the Eustatic Emerged Shorelines ABSTRACT IS8°| 00' KAHUKU POINT __ .Type locality of Kawelo low stand The paper presents new C14 and uran.um series dates on Oahu and their bearing on 0 A H U the dating of fluctuations of sea level dm: to glacioeustatism during the Wisconsinan. The — 60- and — 120-ft shorelines are shown to be Wisconsinan. Scuba and sub- mersible diving has made it possible to study the submerged shorelines. Some of the submerged shorelines are notches in vertical cliffs and were not previously found , KAPAPA ISLAND - by detailed soundings. The —350-ft shelf, \J /¡/ Jk .Konoohe -80ft.shore line previously thought to be a drowned wave- • /^^KEKEPA ISLAND cut platform, proved to be a drowned coral v ULUPAU CRATER reef. Shorelines and drowned reefs indicate r^w « stillstands below sea level at 15, 30, 60, 80, •POPOIA ISLAND 120, 150, 185, 205, 240±, 350, 1,200 to aimanalo shore 1,800, and 3,000 to 3,600 ft. Those above line and Bellows —450 ft are thought to be glacioeustatic. \ Field formation \ MANANA ISLANO Those below —450 ft are the result of sub- Ni«^MoKai Ronge sidence. Key words: Quaternary, -60 ft. and Makapuu -120ft dune limestone, geomorphology, geo- shore lines cbronology. Honaumo Bo/ Koko-l5ft. shelf SLACK PT. KOKO HEAD INTRODUCTION •Type locality of Leahi I shore line All submerged shorelines described Figure 1.
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