The fossil vertebrate collection at the ... Clark’s primary work focused on the Eocene Green River Formation in Utah and the Eocene/Oligocene White River Group in South Dakota and Colorado. His most ...

Imagine an ear falling off a first century Roman statue and you’ll get an idea of what someone found at the Lake Mead National Recreational Area in Arizona. Photos of the fossil — yes, it’s assumed to ...

FLAGSTAFF, Ariz.—The Federal Energy Regulatory Commission has accepted a preliminary permit application for a 24-story dam spanning the Little Colorado River gorge on the Navajo Nation. The proposed ...

The razorback sucker is a large, warm-water fish native to the Colorado River basin. Construction of more than a dozen dams throughout the lower basin has left little natural habitat ... to protect ...