1965/03/12 by Roald Fryxell · 97 citations
Earth and Planetary Sciences · #Geology and Paleoclimatology Research #Climate change and permafrost #Cryospheric studies and observations #Geology #Impact crater #Glacier #Volcano #Volcanic ash #Physical geography #Radiocarbon dating #Range (aeronautics) #Geochemistry #Geomorphology #Earth science #Paleontology #Geography #Astrobiology
paper · doi:10.1126/science.147.3663.1288
published in Science 147(3663), 1288-1290 (American Association for the Advancement of Science)
openalex publication_date 1965/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Physiographic and stratigraphic evidence supports the regional correlation of two volcanic ash layers with extinct Mount Mazama at Crater Lake, Oregon, and Glacier Peak in the northern Cascade Range of Washington. A radiocarbon age of 12,000 +/- 310 years confirms geological evidence that ash derived from the Glacier Peak eruption is substantially older than ash from the Mazama eruption of 6600 years ago.