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Hogg Rock
Tuya
in
Willamette NF
,
Cascade Range
near
Camp Sherman
,
OR
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On Wikipedia
Hogg Rock is a tuya volcano in the Cascade Range of northern Oregon, located west of Santiam Pass beside the Santiam Highway (U.S. Route 20 / Oregon Route 126). The highway wraps in a nearly 180-degree curve below cliffs on the south and west sides. Hogg Rock is only about 2 miles (3 km) north of Hayrick Butte, a somewhat larger tuya of similar age and composition. A tuya is a type of subglacial volcano, formed when lava erupts underneath an overlying glacier or ice sheet and then melts through to the surface and pools, producing the flat plateau on top with near-vertical walls along the ice-contact margin as the lava cools and hardens. Unlike most tuyas which have steep cliffs on all sides, Hogg Rock has a break in its cliffs on the east side, with a moderate slope which leads down to a…
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Taxonomy
Classified As
Tuya
Geologic Formation
Hypabyssal intrusive rocks (ORThi;0)
Geologic Formation
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