James D. Hays, Nicholas J. Shackleton; Globally synchronous extinction of the radiolarian Stylatractus universus. Geology ; 4 (11): 649–652. doi: https://doi.org/10.1130/0091-7613(1976)4<649:GSEOTR>2.0.CO;2
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Through comparison of the extinction level of Stylatractus universus with the δO18 record in widespread high- and low-latitude deep-sea cores, we show that this level is globally synchronous. It occurs in the lower one-third of the isotopic transition between isotope Stages 12 and 11. Several independent estimates of the date of this extinction converge on 410,000 ± 5,000 yr ago. This biostratigraphic datum is now well dated and is globally synchronous.