Marching Rocks (Near Rainbow City)

Vanishing American: Below Marian a cedared plateau, gray with grass and sage, led eastward toward bare mounds of rock, isolated and strangely set, with semblance to great prehistoric beasts. Scattered and striking they led on over the wide green plain, round and bare and huge, all seeming to move forward, to march on, to be impelled, to be endowed with mighty and majestic life. Marching Rocks! Van of the army of naked earth, vast riven mass of rock, rising and spreading from north to south, marching down from afar, driven by the dim slopes and immense heave of mountains! (Chapter VII)