Rock fall reveals ancient animal footprints
FLAGSTAFF, Ariz. --- It's something like a modern-day chuckwalla, strolling in sand dunes on an island in what now is the Grand Canyon region. That's how Steve Rowland, professor e…
FLAGSTAFF, Ariz. --- It's something like a modern-day chuckwalla, strolling in sand dunes on an island in what now is the Grand Canyon region. That's how Steve Rowland, professor e…