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Diatom biostratigraphy and paleoecology of the type section of the Luisian Stage, central California

Micropaleontology
By:  and 

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Abstract

Diatoms from the type section of the Luisian Stage in central California correlate with the lowermost part of the Denticulopsis lauta Zone through the lower part of subzone "a" of the Denticulopsis hustedtii-D. lauta Zone and are early Middle Miocene in age (about 6.0 to 14.0 Ma), Rocks assigned to the Luisian Stage by benthic foraminifers elsewhere in California exhibit little diachroneity in terms of diatom biostratigraphy, however, detailed studies of boundaries have not been done. Planktic diatoms dominate the assemblages, although an increase in benthic and tychopelagic diatoms in the overlying Hames Member of the Monterey Formation probably reflects shoaling. A cooling trend is suggested by diatom assemblages in the upper part of the section and is most marked near the top of the type Luisian. This cooling trend is supported by data elsewhere in the Pacific Basin as well as by both megafossil and microfossil studies in California. One hundred four diatom taxa are documented, and one new species, Coscinodiscus volutus Baldauf, is described.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Diatom biostratigraphy and paleoecology of the type section of the Luisian Stage, central California
Series title Micropaleontology
Edition 59
Volume 28
Issue 1
Year Published 1982
Language English
Publisher Micropaleontology Press
Description 26 p.
First page 84
Country United States
State California
County San Luis Obispbo County