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Kimmeridgian Dinoflagellate Stratigraphy in the Southwestern North Atlantic

M. Zotto, W. S. Drugg and D. Habib
Micropaleontology
Vol. 33, No. 3 (1987), pp. 193-213
DOI: 10.2307/1485637
Stable URL: http://www.jstor.org/stable/1485637
Page Count: 21
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Kimmeridgian Dinoflagellate Stratigraphy in the Southwestern North Atlantic
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Abstract

Restudy of the dinoflagellate stratigraphy of Deep Sea Drilling Project Site 100 in the southwestern North Atlantic reveals six species which indicate that the lowermost part of the sedimentary section is not older than Kimmeridgian. The first appearance datums of four of these species in the Pictonia baylei ammonite zone permits a maximum age close to, or at, the Kimmeridgian/Oxfordian boundary. Correlation of mutually occurring species at D.S.D.P. Sites 100 and 534 suggests that the interval from the first appearance of Occisucysta balios to directly above the last appearance of Stephanelytron scarburghense can be used to distinguish the Kimmeridgian sensu gallico. In the Tethyan province, the Kimmeridgian/Tithonian boundary is tentatively placed between the last appearance of S. scarburghense and the first appearance of Cometodinium whitei. Amphorula metaelliptica first appears in the approximate position of this boundary. The new genus Atlantodinium, and the new species A. jurassicum, are proposed. Amphorula is emended, and the new species A. dodekovae is proposed. The new species, Meiourogonyaulax bejuii, is proposed. The nature of the tabulation of the sulcus may be valuable for recognizing leptodinioid cysts in the Jurassic.

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