The canyons are eroded sandstone created through a combination of flash floods and other subaerial processes. The colours in the canyon red, magenta, gold, orange, pink and vermillion vary depending on the light and time of day.
|Antelope Canyon Spirals|
Both canyons are prone, like all canyons in desert washes, to large flash floods that fill up the slot canyons without warning. Flash floods the second most deadly weather hazard, are particularly dangerous in a slot canyon. After 11 tourists were killed in these canyons in 1997 by a rain storm that occurred 11 km upstream, an alarm horn has been installed at the top of the canyon directly connected to NOAA. All access to these canyons must be done through the Navajo Nation using authorized guides.