Seismologists have counted nine earthquakes in the Washington Cascades, in addition to the 3.5-magnitude event that happened near North Bend on Monday.

A significant area of Cretaceous rock exposures in northwest Montana has been recognized as an International Geoheritage Site, Montana State University announced on Thursday.

For much of the 20th century, dinosaurs had been thought of as lumbering, lizard-like animals. The surprising findings at Egg Mountain suggested dinosaurs were more dynamic and social than previously ...