The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California

Marine Micropaleontology
By: , and 

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Abstract

Four species of the planktonic foraminiferal genus Streptochilus from key Neogene marine localities are documented in relation to the evolution of the Gulf of California: S. globigerus, S. latus, S. macdougallae sp. nov., and S. inglei sp. nov. Planktonic foraminiferal bioevents and strontium isotopes in the Bouse, Tirabuzón, Carmen and Ojo de Buey lithostratigraphic units constrain the local distribution range between 6 and 5.3 Ma for the last three species, whereas S. globigerus appears locally at 5.5 Ma and disappears between 3.79 and 3.46 Ma in the Imperial and Trinidad Formations. The last occurrence of Streptochilus latus, and the first and last occurrences of S. globigerus in the ancient Gulf of California are correlated with bioevents calibrated in the equatorial Pacific; therefore, they can be used as reliable local biostratigraphic markers. The presence of Streptochilus in the ancient Gulf of California seems to correlate with upwelling, in a pattern similar to that observed in the modern oceans.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California
Series title Marine Micropaleontology
DOI 10.1016/j.marmicro.2017.05.001
Volume 132
Year Published 2017
Language English
Publisher Elsevier
Contributing office(s) Geology, Minerals, Energy, and Geophysics Science Center
Description 18 p.
First page 35
Last page 52
Country Mexico, United States
Other Geospatial Gulf of California