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Science 2 December 1966:
Vol. 154. no. 3753, pp. 1173 - 1176
DOI: 10.1126/science.154.3753.1173
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Articles

Lithology and Paleontology of the Reflective Layer Horizon A

Tsunemasa Saito 1, Lloyd H. Burckle 1, and Maurice Ewing 1

1 Lamont Geological Observatory, Columbia University, Palisades, New York

Cores recovered from horizon A are Late Cretaceous (Maestrichtian) in age and consist o alternating layers of calcareous turbidites and "red clay." The presence of red clay suggests that the water depth in this area during Cretaceous time was at least as great as at present—more than 5100 meters. A middle Cretaceous (Cenomanian) core consisting of interbedded sand and gravel and light-to-dark-gray lutite was taken in the same area from a layer stratigraphically below the horizon; the presence of hydrogen sulfide and iron sulfide may indicate anaerobic conditions that may be attributable to local ponding of sediment in Cenomanian time.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Eastern Atlantic Continental Margin: Some Results of the 1972 Cruise of the R.V. Atlantis II.
K. O. Emery and K. O. Emery (1972)
Science 178, 298-301
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Caribbean Eocene Volcanism and the Extent of Horizon A.
P. H. Mattson, P. H. Mattson, and E. A. Pessagno Jr. (1971)
Science 174, 138-139
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Sea-Floor Spreading, Carbonate Dissolution Level, and the Nature of Horizon A.
S. Gartner and S. Gartner Jr. (1970)
Science 169, 1077-1079
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Spores, Pollen, and Microplankton from the Horizon Beta Outcrop.
D. Habib and D. Habib (1968)
Science 162, 1480-1481
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Investigation of Horizon Beta.
C. C. Windisch, R. J. Leyden, J. L. Worzel, T. Saito, and J. Ewing (1968)
Science 162, 1473-1479
   Abstract »    PDF »
Ages of Horizon A and the Oldest Atlantic Sediments.
J. Ewing, J. Ewing, J. L. Worzel, M. Ewing, and C. Windisch (1966)
Science 154, 1125-1132
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