On the eruption age and provenance of the Old Crow tephra

Burgess, S. D., Coble, M. A., Vazquez, J. A., Coombs, M. L., and Wallace, K. L., 2019, On the eruption age and provenance of the Old Crow tephra. Quaternary Science Reviews, v. 207, p. 64-79. https://doi.org/10.1016/j.quascirev.2018.12.026.

The authors investigated the Old Crow tephra found in eastern Beringia utilizing U/Pb, U/Th, and (U-Th)/He zircon geochronology as well as titanomagnetite geochemistry to determine provenance and eruption age. The authors found that the eruption occurred at 202.9 +-9.5 ka from an Aleutian source distinct from the Emmons Lake Volcanic Center. This work introduces a new Old Crow tephra eruption age during the MIS 7 interglacial period which disagrees with previous MIS 5e deposition ages, and highlights the need for more studies investigating Pleistocene chronology in eastern Beringia.