National Geographic : 1926 Jul
THE WORLD'S GREAT WATERFALLS TOP OF UNION FALL, DEVIL'S THROAT CHASM SEEN FROM AN ARGENTINE ISLET AT THE EDGE OF DEVIL'S THROAT CIASM At the right Rivadavia Cataract hurls itself into the chasm. Then comes a tiny intervening islet at the precipice edge; then the high straight foaming creamy column of the first section of Union Fall, and then the typical top of Union Fall, with its eroded topmost section, which causes the river to drop 20 or 25 feet to a narrow shelf and then plunge in a single leap to the bottom of the chasm. Photographs from Theodore W . Noyes SAN MARTiN FALL FROM THE ARGENTINE HOTEL'S PRECIPITOUS HILL The characteristic identifying feature of San Martin is a rock mass, suggesting in shape a half fallen truncated column, which projects from the platform separating the upper and lower falls and which is outlined against the whiteness of the upper fall.