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U.S. Geological Survey
Open-File Report 03-441

DATA REPORT: Geology of Reef-Front Carbonate Sediment Deposits around Oahu, Hawaii

North coast vibracores sketches, descriptions, and photographs

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Vibracore 33V1, north coast

Uniform succession of vaguely-laminated to bioturbated, fine- to medium-grained, foraminiferal/algal/coral carbonate sand: massive appearing owing to extensive bioturbation; light brownish gray (5YR6/1); moderate sorting; common large (1.5-2.5 cm), disarticulated and fragmented pecten bivalves (Chlamys sp.), some oriented subparallel to bedding; locally large (1-2 cm) coaly fragments; sand size clasts angular to rounded; composed mainly of a mix of foraminifera (29.5-35.0%), calcareous algae (15.5-26.5%) and coral fragments (20.5-25.0%); common volcanic rock fragments (2.5-3.5%), carbonate rock fragments (2.5-3.5%) and Halimeda (4.5-5.5%); minor echinoid fragments (1.5-3.5%) and mollusks (1.0-2.0%).

Labelled sketch of core showing bedding and other features
High detail photo of core

 
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last modified 15 December 2003 (cad)

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