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GEOREF RECORD

New evidence for two highstands of the sea during the last interglacial, oxygen isotope substage 5e

C. E. Sherman, C. R. Glenn, A. T. Jones, W. C. Burnett and H. P. Schwarcz
New evidence for two highstands of the sea during the last interglacial, oxygen isotope substage 5e
Geology (Boulder) (December 1993) 21 (12): 1079-1082

Abstract

Sedimentologic, stratigraphic, and geochronologic analyses of a previously undescribed carbonate section on Oahu, Hawaii, provide new evidence for two distinct sea-level highstands on Oahu during the last interglacial period (oxygen isotope substage 5e). Whereas electron-spin-resonance and uranium-series ages (122 + or -8 ka to 152 + or -25 ka, and 115 + or -10 ka to 160 + or -15 ka, respectively) of in situ corals place the age of the deposits within substage 5e, it is the unique sequence of strata found in these exposures that reveals the two transgressions. A highstand lagoonal deposit of coral-algal bafflestone is overlain by large seaward-dipping slabs of beach-rock. The beachrock, deposited during a mid-5e regression, is in turn overlain by a second highstand lagoonal deposit. This sequence was deposited in a broad, shallow, back-reef embayment that was very sensitive to fluctuations in sea level. Elsewhere, along much of the shoreline of Oahu, an in situ coral-algal framestone (Waimanalo Formation), representing the initial 5e highstand, is erosionally truncated on its upper surface. This erosional unconformity represents the mid-5e lowstand and separates the framestone from overlying, seaward-dipping, planar-bedded grainstone and rudstone (Leahi Formation) that accumulated during the second 5e highstand.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 21
Serial Issue: 12
Title: New evidence for two highstands of the sea during the last interglacial, oxygen isotope substage 5e
Affiliation: University of Hawaii, Department of Geology and Geophysics, Honolulu, HI, United States
Pages: 1079-1082
Published: 199312
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 1993-039065
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Univ. Hawaii, Sch. Ocean and Earth Sci. and Technol., Contrib. No. 3163
Illustration Description: illus. incl. 2 tables, sketch map
N21°18'00" - N21°19'60", W158°10'00" - W158°00'00"
Secondary Affiliation: Florida State University, USA, United StatesMcMaster University, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1993
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