While hiking deep in the Great Smoky Mountains National Park, explorers stumbled upon bizarre, ancient-looking rock ...

Anywhere from 85-120 million years ago magma from an arc of erupting volcanoes solidified deep within the Earth’s crust and began the process of creating the Sierra Nevada. Tectonic plates began to ...

Marian Posey grew up northeast of Jerome and, even as a child, paid particular attention to the many rock structures that surrounded her home. As an architectural historian, she later took on the ...

To date, many geologists and geophysicists commonly accept that multiple thrust structures are formed by one thrust having been overridden by a younger one, which in turn is overridden by another even ...