7 billion years ago during the Precambrian Era. 0 billion years old, making them among the oldest rocks found in the United States. 6 billion years ago, massive volumes of magma pushed into these ...

The Rocky Mountain chain is a fascinating geologic formation, as it (at least, at first glance) defies some basic geological rules, including that most mountain ranges form subduction zones. A new ...

The western U.S. is a geologists' dream, home to the Rocky Mountains, the Grand Canyon, active volcanoes and striking sandstone arches. But one landform simply doesn't make sense. New evidence has ...

Here’s what you’ll learn when you read this story: The Rocky Mountain chain is a fascinating geologic formation, as it (at least, at first glance) defies some basic geological rules, including that ...