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A paleoenvironmental study of early to middle Pleistocene foraminifera of the Santa Barbara Formation at Santa Barbara, California

Published online by Cambridge University Press:  20 May 2016

R. Timothy Patterson ,
Charlotte A. Brunner ,
Rosemary Capo  and
Jeremy Dahl
R. Timothy Patterson
Affiliation:
1Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada
Charlotte A. Brunner
Affiliation:
2Center For Marine Science, University of Southern Mississippi, Stennis Space Center 39529
Rosemary Capo
Affiliation:
3Department of Earth and Space Sciences, University of California, Los Angeles 90024
Jeremy Dahl
Affiliation:
3Department of Earth and Space Sciences, University of California, Los Angeles 90024
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Abstract

An interval of the Early to Middle Pleistocene history of the California Borderland was assessed using multivariate analysis of foraminifera from the Santa Barbara Formation at Bathhouse Beach, Santa Barbara, California. A census of 93 species of benthic foraminifera and nine species of planktonic foraminifera was compiled from 11 samples from the shelly marls, silts, and sands of the lower member. Most species of benthic foraminifera are rare and only 38 species comprise one percent or more of the population in one or more samples.

Paleoenvironment of the sea floor was determined based on benthic foraminifera. R-mode cluster analysis defined five associations which are similar to those of the present-day banks and terraces of the California Borderland. Q-mode cluster analysis grouped samples into four biofacies which characterize shallow banks near 50 meters water depth and off-shore ridges and deep banks averaging 150 meters water depth. The stratigraphic succession of biofacies indicates two transgressive cycles separated by an apparent disconformity between 7.5 and 8.9 meters above the base of the section (between samples 3 and 4).

Paleoceanography of surficial waters was interpreted from planktonic foraminifera. Paleotemperature was assessed from the proportion of sinistral to dextral morphs and from the proportion of encrusted, compact morphs to reticulate, globular morphs of Neogloboquadrina pachyderma. The coiling morphs show a warm interval from the base of the section to about 12 meters (between samples 5 and 6), and a cooler interval from about 12 meters to about 24 meters (between samples 10 and 11), and an interval of intermediate paleotemperature in the topmost sample of the section. Changes in the planktonic assemblage do not coincide with the transgressive cycles inferred from the benthic biofacies.

The Bathhouse Beach section can be placed chronostratigraphically based on planktonic foraminiferal coiling shifts and strontium isotopic data. The isotopic age range of 400 to 900 Kyr brackets the 600 Kyr age assigned by Lagoe and Thompson (1988) to the Neogloboquadrina pachyderma coiling dominance interval CD9/CD8 boundary which occurs midway in the section, between samples 5 and 6.

Type
Research Article
Information
Journal of Paleontology , Volume 64 , Issue 1 , January 1990 , pp. 1 - 25
Copyright
Copyright © The Paleontological Society 

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