The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |