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The AMSOC Committee of the National Academy of Sciences-National Research Council has determined that it is both feasible and desirable to drill a hole through the earth's crust for the main purpose of obtaining as much sample as possible of the mantle. The hole must be drilled in either the Pacific or Atlantic Ocean basin where the crust is thin enough to be penetrated. Detailed surveys have been carried out in the area north of San Juan, Puerto Rico, on the rise north of the Puerto Rican trench. The survey area covers about 5 square degrees. In the Pacific a smaller area 50 miles southwest of Guadalupe Island has been surveyed. One of these sites will be chosen for drilling to the mantle. The project will be carried out in 3 phases: Phase I will consist of modifying a d illing barge for deep-water operation. As many test holes as the project can afford will be drilled. Several complete sedimentary core sections will be obtained which will yield information on coring methods in unconsolidated sediments, as well as paleontological, mineralogical, and structural knowledge of deep-sea sediments, which never before has been obtained. The preliminary holes will go to depths of 18,000 feet and in some places it is expected that the second layer will be penetrated. Phase II will begin with the application of the engineering data found in phase I to the design of a new drilling barge. The new barge will be constructed and moved into place. Phase III encompasses the actual drilling of the deep mantle hole, the scientific direction of the work, field analysis of t e results, and later laboratory analysis.
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