Radiolarian Evidence Consistent with Spreading of the Pacific Floor

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Science  04 Aug 1967:
Vol. 157, Issue 3788, pp. 540-542
DOI: 10.1126/science.157.3788.540


In sediments west of the East Pacific Rise between the equator and 20°N, Eocene microfossils are recorded no farther east than 134°W; Oligocene, no farther east than 125°W; while Miocene and Pliocene occurrences extend closer to the crest of the rise. This distribution may result from post-Eocene spreading of the sea floor here averaging about 8 centimeters per year.