![CastleRock](https://webarchive.library.unt.edu/eot2008/20081111165102im_/http://3dparks.wr.usgs.gov/3Dbayarea/images/CastleRock.jpg) |
CastleRock.jpg - This jumble of boulders and oak trees is located along
the Castle Rock trail that starts near the state park office parking area.
Amassive sandstone of Tertiary age (Oligocene) Vaqueros, Sandstone Formation
crop out along Skyline Ridge throughout much of the central Santa Cruz Mountains.
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![CastleRock](https://webarchive.library.unt.edu/eot2008/20081111165102im_/http://3dparks.wr.usgs.gov/3Dbayarea/images/CastleRock2.jpg) |
CastleRock2.jpg - Goat Rock displays typical "tafoni"-style
weathering of the Vaqueros Sandstone cliffs along Skyline Ridge in Castle
Rock State Park. |
![CastleRock](https://webarchive.library.unt.edu/eot2008/20081111165102im_/http://3dparks.wr.usgs.gov/3Dbayarea/images/CastleRock3.jpg) |
CastleRock3.jpg - Another example of tafoni-style weathering of an
outcrop of Vaqueros Sandstone in Castle Rock State Park. |
![CastleRock](https://webarchive.library.unt.edu/eot2008/20081111165102im_/http://3dparks.wr.usgs.gov/3Dbayarea/images/CastleRock4.jpg) |
CastleRock4.jpg - More tafoni-style weathering of Vaqueros Sandstone. |
![CastleRock](https://webarchive.library.unt.edu/eot2008/20081111165102im_/http://3dparks.wr.usgs.gov/3Dbayarea/images/CastleRock5.jpg) |
CastleRock5.jpg - The western flank of Skyline Ridge is warmer and dryer
and is host to a chaparral ecosystem, unlike the redwood and pine-dominated
eastern flank of Skyline Ridge located in Sanborn County Park. |