Correlation of the middle eocene Kellogg Shale of northern California

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The Kellogg Shale of northern California has traditionally been considered to be late Eocene in age on the basis of benthic foraminifer, radiolarian, and diatom correlations. The 30-m-thick Kellogg section exposed west of Byron, California, however, contains middle Eocene planktonic foraminifers (Zone P12), coccoliths (Subzones CP13c and CP14a), silicoflagellates (Dictyocha hexacantha Zone), and diatoms. Quantitative studies of the silicoflagellates and diatoms show a general cooling trend through the section which is consistent with paleoclimatic trends for this part of the middle Eocene (ca. 42-45 Ma) from elsewhere in the world. Seven new silicoflagellate taxa (Corbisema angularis, C. exilis, C. hastata miranda, C. inermis ballantina, C. regina, Dictyocha byronalis, Naviculopsis americana) and one new coccolithophorid species (Helicosphaera neolophota) are described.

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Publication type Article
Publication Subtype Journal Article
Title Correlation of the middle eocene Kellogg Shale of northern California
Series title Micropaleontology
DOI 10.2307/1485715
Volume 30
Issue 2
Year Published 1984
Language English
Publisher The Micropaleontology Project., Inc.
Contributing office(s) St. Petersburg Coastal and Marine Science Center, Volcano Science Center
Description 33 p.
First page 138
Last page 170
Country United States
State California
Other Geospatial Northern California
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