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United States
California
Contra Costa County

Sandstone caves in Castle Rock formations

Discover
Places to see

Caves

United States
California
Contra Costa County

Sandstone caves in Castle Rock formations

Highlight β€’ Cave

Sandstone caves in Castle Rock formations

Recommended for

Mountain biking

by 7 explorers

This Highlight is in a protected area

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    Location: Contra Costa County, California, United States

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    Tips

    June 16, 2016

    Mountain biking

    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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    Best routes to Sandstone caves in Castle Rock formations

    3.5

    (2)

    12

    riders

    1. Wall Point & Barbecue Terrace Road loop β€” Mount Diablo State Park

    28.7km

    03:03

    800m

    800m

    Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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    Moderate

    Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

    Moderate

    Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

    Moderate

    Details

    Informations

    Elevation 100Β m

    Weather

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    Wednesday 4 February

    21Β°C

    3Β°C

    0Β %

    Additional weather tips

    Max wind speed: 6.0Β km/h

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    Location: Contra Costa County, California, United States

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