Event Name : Augustine Young Domes
Start: 350 | Years BP Tephrochronology | |
Stop: | 1812 | Tephrochronology |  |
Lava dome: |
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Eruption Type: | Explosive | |
Other | "" | |
Description: From Waitt and Beget (1996): "Two domes of porphyritic gray andesite form conspicuous topographic bumps at altitudes 1025 and 910 m on the upper northwest flank, some 400 to 800 m northwest of the central summit-dome complex. The large West lsland debris avalanche (table 3 [in origincal text]) must have left a large crater including this area so the domes must be younger than about 350 yr B.P. (age of B tephra, table 2 [in original text]), though they precede the historic eruptions."