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Paleontology
in the San Francisco Bay Region

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Biostratigraphic framework shown here is a composite of the international time scale developed by Berggren and others (1985) and Aubrey and others (1988) correlated with the planktic foraminiferal zones of Blow (1969, 1979) and Berggren (1972), calcareous nannofossil zones of Bukry (1973, 1975), Okada and Bukry (1980), and Martini (1971), and provincial California benthic foraminiferal zonations of Kleinpell (1938) and Mallory (1959), with modifications as proposed by Addicott and others (1980), Almgren and others (1988), McDougall (1980, 1983, 1989), and Blake (1991).

Timescale
Timescale

 

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The URL of this page is http://sfgeo.wr.usgs.gov/sfbay/timescale.html
Updated: 19 March 2002

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