Residing in the national monument named after it, the Devils Postpile is a cliff of columnar basalt, a type of rock formed by the rapid cooling of lava. These towers – some of which look as ...

They are columnar basalt formations, often with cascading ... They’re shaped by the physics involved in the cooling of the rock after a lava flow. “When the flow cools, the outside cools ...

The hills are formed of carboniferous basaltic lava and ash on sandstone. Part of Wester Craiglockhart has an exposed upper lava deposit about 30 metres thick features a central area of well-formed ...