Just out | The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California @ Marine Micropaleontology


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


Author(s)

Adriana Yanet Miranda-Martínez, Ana Luisa Carreño, Kristin McDougall


Abstract:

Four species of the planktonic foraminiferal genus Streptochilus from key Neogene marine localities are documented in relation to the Gulf of California evolution: 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 gulf.


Keywords: Streptochilus; Planktonic foraminifera; Gulf of California; Neogene; Biostratigraphy


DOI: 10.1016/j.marmicro.2017.05.001


READ IT HERE: http://www.sciencedirect.com/science/article/pii/S0377839817300609


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