Paleogene accretion of Upper Cretaceous oceanic limestone in northern California ( USA).

W. V. Sliter, R. J. McLaughlin, G. Keller, W. R. Evitt

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Blocks of pelagic limestone, tectonically incorporated into coastal terrane melange, contain planktonic foraminifers of early Campanian to middle Maestrichtian age (82-69Ma) typical of low latitudes between 20oN and 20oS. Carbonate concretions from the sheared terrigenous matrix of the melange yield temperate, middle-latitude planktonic foraminifers and dinoflagellates of middle to late Eocene age (49-41Ma). The pelagic limestone and the basaltic substrate presumably formed on the E flank of the Pacific-Farallon spreading ridge in a low-latitude zone of high productivity and migrated N on the Farallon plate until approx 40Ma when they initially encountered terrigenous turbidites N of lat. 30oN. N translation and final accretion were completed by approx 25Ma.-Authors

Original languageEnglish (US)
Pages (from-to)350-353
Number of pages4
Issue number4
StatePublished - 1986

All Science Journal Classification (ASJC) codes

  • Geology


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