A.L. Carreno
Kristin McDougall
A.Y. Miranda Martinez
2017
<p><span>Four species of the planktonic foraminiferal genus </span><i>Streptochilus</i><span> from key Neogene marine localities are documented in relation to the evolution of the Gulf of California: </span><i>S. globigerus</i><span>, </span><i>S. latus</i><span>, </span><i>S. macdougallae</i><span> sp. nov., and </span><i>S. inglei</i><span> 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 </span><i>S. globigerus</i><span> 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 </span><i>Streptochilus latus</i><span>, and the first and last occurrences of </span><i>S. globigerus</i><span> 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 </span><i>Streptochilus</i><span> in the ancient Gulf of California seems to correlate with upwelling, in a pattern similar to that observed in the modern oceans.</span></p>
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10.1016/j.marmicro.2017.05.001
en
Elsevier
The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California
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