Water, wind, and calcite erosion in per-volcanic sandstone formation.
Slightly acidic rainwater seeps into the sandstone during winter rains and dissolves some of the calcite. Warm and dry days cause the moisture to pull the dissolved calcium back out of the rock, causing holes and caves to form.
Watch for peregrine falcons and other birds of prey nesting high up in the Castle Rock caves.
The upper trails are closed Feb-July to avoid disturbing the nesting birds.

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Ruter i nærheden

Bedste ruter nær Sandstone caves in Castle Rock formations

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1. Diablo Foothills Regional Park loop — Walnut Creek

14,9km

01:32

350m

This moderate 9.2-mile mountain bike loop in Diablo Foothills Regional Park offers varied terrain and views of Mount Diablo and Castle Rocks

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2. Wall Point & Barbecue Terrace Road loop — Mount Diablo State Park

28,7km

03:03

800m

Tackle the moderate 17.8-mile Wall Point and Barbecue Terrace Road Loop in Mount Diablo State Park, featuring tough climbs and panoramic vie

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3. Twin Ponds – Old Borges Ranch loop from Walnut Creek

24,6km

02:09

430m

Middel mountainbiketur. Kræver god kondition. Egnet for alle færdighedsniveauer.

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Detaljer

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Højdemeter 100 m

Vejr

Drevet af Foreca

I dag

lørdag 21. marts

29°C

13°C

0 %

Flere vejrtips

Maks. vindhastighed: 15,0 km/h

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Placering: Contra Costa County, Californien, Amerikas Forenede Stater

Andre populære steder, du kan udforske

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Ygnacio Canal Trail at Pine Creek

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Mt. Diablo from North Gate Climb

Heather Farm & Lake

Diablo Valley Overlook

Lafayette-Moraga Trail

Sandstone caves in Castle Rock formations

1. Diablo Foothills Regional Park loop — Walnut Creek

2. Wall Point & Barbecue Terrace Road loop — Mount Diablo State Park

3. Twin Ponds – Old Borges Ranch loop from Walnut Creek

Andre populære steder, du kan udforske

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