It is named after Capricorn Mountain, the third highest subsidiary peak of Meager.
The assemblage was formed during a period of volcanic activity about or less than 90,000 years ago.
[1] Weathered rhyodacite is the main volcanic rock comprising the Capricorn Assemblage.
It forms the final 600 m (2,000 ft) of Capricorn Mountain and Mount Job.
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