Jurassic Sandstone from the Tropical Atlantic

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Science  25 Dec 1970:
Vol. 170, Issue 3965, pp. 1402-1404
DOI: 10.1126/science.170.3965.1402-a


The oldest sediment yet sampled from the abyssal margins of South America, late Jurassic (or possibly very early Cretaceous) shallow-water, coarse-grained, calcareous sandstone containing palynomorphs and mollusk prisms, was recovered from a depth of 4400 meters on the seaward scarp of the Demerara Plateau. The sandstone was deposited in a shallow, late Jurassic epicontinental sea after the initial stages of rifting when the newly created Atlantic began to founder.