Abstract
SAMPLES of two types of rocks containing organic material were collected from 65° 41′ 24″ W., 20° 15′ 58″ N. during a cruise of the R.V. Chain of the Woods Hole Oceanographic Institution to the north wall of the Puerto Rico Trench (Fig. 1). One of the samples is soft material, predominantly organic (Ch 34–D3). The other sample is hard material, a mudstone into which organic material seems to have migrated and subsequently been silicified (Ch 34–D3–182). This organic material and the associated basalts, limestones, cherts and siliceous mudstones were collected from depths of between 3,350 and 3,450 fathoms1,2. These are the first organic samples obtained from ocean depths of this magnitude. The limestones collected in the same dredge haul are Cenomanian in age3; however, the age of the organic material is unknown.
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References
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FRIEDEL, R., NALWALK, A. Characterization of Carbonaceous Material from the Puerto Rico Trench of the Atlantic Ocean. Nature 217, 345–347 (1968). https://doi.org/10.1038/217345a0
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DOI: https://doi.org/10.1038/217345a0
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