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By Manik Talwani, William Hay, William B. F. Ryan

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Published by means of the yank Geophysical Union as a part of the Maurice Ewing Series.

The moment Maurice Ewing Symposium was once dedicated to the results of deep drilling leads to the Atlantic Ocean. This topic was once selected for 2 purposes. First, Maurice Ewing was once one of many leaders of JOIDES (Joint Oceanographic associations For Deep Earth Sampling), the organization of oceanographic associations that was once shaped to prepare and sponsor drilling within the deep ocean, and which has persevered to supply clinical suggestion to the Deep Sea Drilling venture. moment, the 1st part of foreign software of Ocean Drilling within the Atlantic was once accomplished and it appeared a great time to evaluate the results of drilling leads to the Atlantic that were got over nearly a decade.

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With presently available data, we cannot satisfactorily resolve this question. Regional Aspects. Variegated claystones were penetrated in seven other sites on the Bermuda Rise (Sites 7A, 9A, 387), New England Seamounts (382, 385), lower continental rise (105), BlakeBahama Basin (39lA,C), and perhaps on the Greater Antilles Outer Ridge (28) where a few fragments of red and variegated claystones were recovered (Table 9, Figures 12, 24). Composition of the claystones is variable. For example, zeolites are not reported from Sites 7A, 387 and 391 (Table 10).

Scale bar 10 wm. 4m @ PLANTAGENET TYPE SECTION . '. CRESCENT PEAKS TYPE SECTION ',,:' o ': ~~~~::~::EA~:ENT. ~i . . 385 :'. ~:::~MATI:~ ~: _I . • _ ~ b ~~~ -~~ -~ 20g0 ...... 4 (92-112). \' . I '1' ... / , I I I .. ":':'.. / / ~o,<'f if PLANTAGENET~ • ~o ~ ~ ~/ • 391 A,e / 8) ~//,,% ................ Vol. ) / I -~/~~~ GSC Figure 12. Boreholes that have cored sediments of the Plantagenet Formation and Crescent Peaks Member. Italicized numbers show thickness of Crescent Peaks (metres). Thicknesses in parenthesis are of Plantagenet Formation.

1972) to compare the Plantagenet clays with the Red Sea brine deposits and speculate that the enrichment in metallic ions was due to volcanic hydrothermal exhalations. However, the formation at most sites is not near any recognized spreading centre or active rift, JANSA Copyright American Geophysical Union 29 Maurice Ewing Series Deep Drilling Results in the Atlantic Ocean: Continental Margins and Paleoenvironment z 0 ~ et 2: 0: ~ SITE 386 NANNOFOSSILS FORAMINIFERS RADIOLARIANS OKADA AND THIERSTEIN (1979) McNULTY (1979) TUCHOLKE, VOGT ET AL.

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