
Each layer of rock has its own origin story, told by its color.
Brick-Red
Clinker forms when coal veins catch fire and bake the rock above, changing it into this much harder, red rock.
Brown and Tan
Sandstone, siltstone, and mudstone are sediments washed down from the Rocky Mountains.
Black
Coal is the remains of ancient plants and animals that lived in Everglades-like swamps.
Blue-grey
Bentonite clay is made of ash from distant volcanoes.
Brick-Red
Clinker forms when coal veins catch fire and bake the rock above, changing it into this much harder, red rock.
Brown and Tan
Sandstone, siltstone, and mudstone are sediments washed down from the Rocky Mountains.
Black
Coal is the remains of ancient plants and animals that lived in Everglades-like swamps.
Blue-grey
Bentonite clay is made of ash from distant volcanoes.
Is there something we missed for this itinerary?
Itineraries across USA

Acadia

Arches National Park

Badlands

Big Bend

Biscayne

Black Canyon Of The Gunnison

Bryce Canyon

Canyonlands

Capitol Reef

Carlsbad Caverns

Channel Islands

Congaree

Crater Lake

Cuyahoga Valley

Death Valley

Dry Tortugas

Everglades

Gateway Arch

Glacier

Grand Canyon

Grand Teton

Great Basin

Great Smoky Mountains

Guadalupe Mountains

Haleakalā

Hawaiʻi Volcanoes

Hot Springs

Indiana Dunes

Isle Royale

Joshua Tree

Kenai Fjords

Kobuk Valley

Lassen Volcanic

Mammoth Cave

Mesa Verde

Mount Rainier

North Cascades

Olympic

Petrified Forest

Pinnacles

Rocky Mountain

Saguaro

Shenandoah

Theodore Roosevelt

Virgin Islands

Voyageurs

White Sands

Wind Cave

Yellowstone

Yosemite

Zion