270 Myr limestone. Shouts leave here; first echo returns in 0.9 s off the far wall.
Wind-laid sandstone that rings like a drum skin at high voice power.
Soft red slope that swallows claps — switch to drum to punch through.
Banded ledges double each echo. Watch rings split as they cross the strata.
1.8 Byr granite riverbed. Song mode sustains — rings orbit instead of fading.
Five layers, 1.8 billion years. Choose a stratum and the canyon reads its diary entry aloud in stone.
Warm shallow sea. Trilobites commute; lime mud settles into the rim you shout from.
A billion missing years between Supai and Vishnu. The canyon forgot, then kept cutting.
Dark streaks are bacterial sunscreen, centuries per millimetre. Do not touch the varnish.
The Colorado cuts 1 cm a decade. Your shout outlasts empires; the river outlasts shouts.