Correlation of the middle Eocene Kellogg Shale of northern California


Autoria(s): Barron, John A.; Bukry, David; Poore, Richard Z.
Data(s)

01/01/1984

Resumo

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, hastate miranda, C. inermis ballantina, C. regina, Dictyocha byronalis, Naviculopsis Americana) and one new coccolithophorid species (Helicosphaera neolophota) are described.

Formato

application/pdf

Identificador

http://digitalcommons.unl.edu/usgsstaffpub/269

http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1263&context=usgsstaffpub

Publicador

DigitalCommons@University of Nebraska - Lincoln

Fonte

USGS Staff -- Published Research

Palavras-Chave #Earth Sciences
Tipo

text