Tao House Grooved Rock
Open in Google Maps

Tao House Grooved Rock


Tao House Grooved Rock

This site is named for Eugene O’Neill’s nearby Tao House–a National Historic site.

This rock sits all by itself in the middle of a big field on the side of Las Trampas Ridge. Across the San Ramon Valley to the east looms Mt. Diablo. The grooves in the rock are straight and of an even depth. Could ancient tree or shrub limbs (nothing like that there now) have scratched out such a regular design? What are the odds of that?

We don’t know what, if any, function this rock may have had in Tatcan life. Visit it and see if you come up with any ideas.