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

June 27, 2017

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.

Publication Year 2017
Title The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California
DOI 10.1016/j.marmicro.2017.05.001
Authors A.Y. Miranda Martínez, A.L. Carreño, Kristin McDougall
Publication Type Article
Publication Subtype Journal Article
Series Title Marine Micropaleontology
Index ID 70188886
Record Source USGS Publications Warehouse
USGS Organization Geology, Minerals, Energy, and Geophysics Science Center