著者ちょしゃ
John J Clague, Stephen G Evans, Vern N Rampton, Glenn J Woodsworth
公開こうかい
1995/8/1
論文ろんぶん
Canadian Journal of Earth Sciences
まき
32
ごう
8
ページ
1172-1179
出版しゅっぱんしゃ
NRC Research Press
説明せつめい
New 14C ages date the eruptions that produced the White River and Bridge River tephras, two important Holocene marker beds in western Canada. The 14C ages were obtained on trees in growth position buried in coarse tephra and a pyroclastic flow near the source vents. The mean calendric age of the White River eruption, based on four 14C ages, is 1147 cal years BP (calibrated years, approximately equivalent to calendric years) or AD 803 (the 2σしぐま age range, obtained from the two most precise 14C ages, is 1014–1256 cal years BP or AD 694–936). The mean age of the Bridge River eruption, determined both from (i) the single most precise outer-ring 14C age and (ii) the weighted mean of six outer-ring 14C ages is 2360 cal years BP or 411 BC (2σしぐま age range = 2349–2704 cal years BP or 755–400 BC).
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