Rising north of Butte, east of Deer Lodge, south of Highway 12 between Helena and Garrison Junction, and west of the ...

The geological abnormality is part of the Boulder Batholith, a 1.2 million-acre mass of igneous rock created by volcanic eruptions millions of years ago. The 160 acres known as Ringing Rocks is ...

This solidified intrusive section of an arc is known as a batholith, and is commonly exposed at the Earth’s surface millions of years after the cessation of subduction and volcanism. Simplified cross ...