Goat Rocks

sopka (bez známé erupce za posledních ~12 000 let), United States, North America Volcanic Regions

Kde

United States, North America Volcanic Regions

Typ (GVP)

Stratovolcano

Nadmořská výška

2 494 m

Poloha

46,500°, -121,400°

The deeply eroded Goat Rocks stratovolcano was active between about 2.5 and 0.5 million years ago (Ma) (Swanson, in Wood and Kienle 1990). The andesitic volcano was constructed over older products of a major rhyolitic explosive eruption. During the late Pliocene and early Pleistocene the small Hogback Mountain shield volcano was constructed south of White Pass. About 1.0 Ma the Tieton Andesite, the earth's largest known andesitic lava flow, traveled 80 km to the east. Following extensive erosion, mid to late Pleistocene andesites were erupted onto the glaciated Cispus River valley.

Text: Smithsonian Global Volcanism Program.

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