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Geology of Mount Shasta

Table 1

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Ages of Eruptive and Glacial Episodes on Mount Shasta

Eruptive/Glacial episode: Episode began (yrs bp) Episode ended (yrs bp)
Hotlum 9,500 to 9,700 200(?)
Shastina 9,700 9,500
Late Wisconsin 32,000 13,000
Misery Hill 30,000 to 50,000 9,600 to 9,700
Early Illinoian 194,000 133,000
Sargents Ridge 200,000 to 300,000 100,000 to 200,000
Dates for eruptive episodes from Christiansen and Miller (1997). Dates for glacial episodes from Shackelton and Updyke (1973).
 

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