Ancient CivilizationsEXPLORATIONS IN GRAND CANYON Posted on January 30, 2021January 30, 2021 by Administrator The latest news of the progress of the explorations of what is now regarded by scientists as not only the oldest archaeological discovery in the United States, but one of the most valuable in the world, which was mentioned some time ago in the Gazette, was brought to the city yesterday by G.E. Kinkaid, the explorer who found the great underground citadel of the Grand Canyon during a trip from Green River, Wyoming, down the Colorado in a wooden boat, to Yuma, several months ago.