Geochronology
Geochronology
GChron
Articles | Volume 4, issue 1
Articles | Volume 4, issue 1
https://doi.org/10.5194/gchron-4-191-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-4-191-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 4, issue 1
Research article
 | 
07 Apr 2022
Research article |  | 07 Apr 2022

Cosmogenic ages indicate no MIS 2 refugia in the Alexander Archipelago, Alaska

Caleb K. Walcott, Jason P. Briner, James F. Baichtal, Alia J. Lesnek, and Joseph M. Licciardi

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Latest update: 31 May 2025
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Short summary
We present a record of ice retreat from the northern Alexander Archipelago, Alaska. During the last ice age (~ 26 000–19 000 years ago), these islands were covered by the Cordilleran Ice Sheet. We tested whether islands were ice-free during the last ice age for human migrants moving from Asia to the Americas. We found that these islands became ice-free between ~ 15 100 years ago and ~ 16 000 years ago, and thus these islands were not suitable for human habitation during the last ice age.
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