Event Name : Aniakchak ECR-162 TephraThis is a questionable event.
|Start: 4485 (± 30 Years) || Years BP C-14 (raw) || |
From Payne and others (2008): "The ECR 162 tephra is the most geochemically distinctive tephra located in these sites. EPMA data suggest a good correlation with tephra from Aniakchak. The tephra is dated 5300-5030 cal yr BP, considerably older than the very large caldera-forming event in the fourth millennium BP (Aniakchak II; Miller and Smith, 1987; Begét and others, 1992). A previous caldera-forming event is probably older than this tephra (ca. 8200 cal yr BP; VanderHoek and Myron, 2004). There are no known Aniakchak eruptions around this date. Miller and Smith (1987) discussed an eruption of the adjacent Black Peak with an uncalibrated date of 4470+/-200 14C yr BP, very close to the uncalibrated date of ECR162 at 4485+/-30 14C yr BP. However, geochemical similarity with Black Peak tephra is low, although there are comparativelyfew published data from this volcano (Riehle and others, 1999). Despite the similarity in age with Black Peak, based on the geochemical composition the most probable source of the tephra is a previously unknown eruption of Aniakchak."