Event Name : Moffett Main Ash
|Start: 6695 (± 45 Years) || Years BP C-14 (raw) || |
|Stop: 8310 (± 265 Years) || Years BP C-14 (raw) || |Description:
Waythomas and others (2003) tentatively identify Moffett Volcano as the source of the Main Ash, observed on Adak Island and also called AD-5 by Kiriyanov and Miller (1997).
From Okuno and others (2012): "The Main tephra-fall deposit covers multiple tephra-soil complexes (thickness = 14cm) of multiple, fine, thin tephra and soil (Waythomas and others 2001) and glacial till deposits. The Main tephra-fall deposit is 30cm thick and consists of coarse pumice (maximum pumice size, MP= 1.5cm) and a consolidated ash layer as thick as 5cm in the upper part."
From Waythomas and others (2001): "The most conspicuous tephra deposit on Adak Island, the Main Ash, has long been regarded as the pyroclastic-fall deposit associated with the caldera-forming eruption that destroyed ancestral Mount Kanaton (Coats, 1956; Black, 1980). However, none of the dated tephra deposits on Kanaga Island matches the radiocarbon ages associated with the Main Ash (fig. 13 [in original text])."