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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 40 (1970)No. 2. (June), Pages 682-687

Nautiloids and Current Ripples as Paleocurrent Indicators in Upper Ordovician Limestones, Anticosti Island, Canada

Owen A. Dixon

ABSTRACT

Several hundred orthoconic nautiloids on a widely exposed bedding plane in the Ellis Bay Formation show a pronounced apical orientation indicating southwestward paleocurrents. Large separated current ripples on the same bedding plane strike nearly perpendicular to the orthocone azimuth. Tidal currents recurring in an environment of shallow water carbonate sedimentation may explain the sequence of events represented by these strata.


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