Alaskan Upper Miocene Marine Glacial Deposits and the Turborotalia pachyderma Datum Plane

See allHide authors and affiliations

Science  31 Oct 1969:
Vol. 166, Issue 3905, pp. 607-609
DOI: 10.1126/science.166.3905.607


ln southeastern Alaska the first marine evidence of widespread glaciation occurs in Miocene sections near the base of the Yakataga Formation. An associated temperature decrease of about 10°C is indicated by the influx of an upper Miocene cold-water planktontic foraminifer, Turborotalia pachyderma, an event that occurred about 13 million years ago.

Stay Connected to Science