https://www.usgs.gov/publications/pumice-interglacial-whidbey-formation-blowers-bluff-central-whidbey-island-wa-usa
A new 40Ar/39Ar age of 128??9 ka and chemical analyses of pumice layers from interglacial alluvium at Blowers Bluff, Whidbey Island, WA, show that the deposits...
whidbey formationpumiceinterglacialblowersbluff