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- W2033487624 abstract "Tertiary sediments exposed in the central Oregon Coast Range were examined for calcareous nannoplankton and planktonic Foraminifera. Twenty-one samples were obtained from the Tyee, Yamhill and Nestucca Formations, the unnamed siltstone at Alsea Bay, the Yaquina Formation, and the Nye Mudstone. These formations previously have been correlated with the Ulatisian through Saucesian microfaunal stages recognized in California. Plankton were recovered from samples of the Tyee Formation, the “siltstone of Alsea” and the Nye Mudstone. The Tyee plankton, including Clavigerinella colombiana, Subbotina bolivariana, Truncorotaloides collactea, and Pseudohastigerina sharkriverensis, have been reported from the Middle Eocene elsewhere. Common planktonic Foraminifera of the “siltstone of Alsea” are Globigerina minima, G. senilis, and Chiloguembelina cubensis. Calcareous nannoplankton include Reticulofenestra scissura, Chiasmolithus cf. C. oamaruensis, and Isthmolithus recurvus. This assemblage suggests correlation of this siltstone with Late Eocene or basal Oligocene of the standard tropical plankton zonation. Planktonic Foraminifera from the upper Nye Mudstone include Globigerina euapertura, G. juvenilis, G. praebulloides, and Globigerinoides primordius, which suggest an Early Miocene age. Characteristically, the plankton specimens show much morphological variation. Generally, the plankton are sparse with lower species diversity than tropical assemblages of similar age. These observations suggest that the site of deposition was perhaps in nearshore areas, isolated from lower-latitude plankton provinces by southward-flowing currents." @default.
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- W2033487624 date "1972-08-01" @default.
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- W2033487624 title "Calcareous plankton from the tertiary of oregon" @default.
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- W2033487624 doi "https://doi.org/10.1016/0031-0182(72)90007-7" @default.
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