Rock fall at Grand Canyon reveals ancient animal footprints
FLAGSTAFF, Ariz. - It's something like a modern-day chuckwalla, side-stepping sand dunes on an island in what now is Grand Canyon National Park. That's how Steve Rowland, a profess…
FLAGSTAFF, Ariz. - It's something like a modern-day chuckwalla, side-stepping sand dunes on an island in what now is Grand Canyon National Park. That's how Steve Rowland, a profess…