Where In Walnut Creek Are These Rocks?

You may have seen them, although you'd be passing by them pretty quickly when you did.

A group of fairly large rocks adorns a hillside somewhere in Walnut Creek.

Have you seen these gray and white boulders in your travels around town? Do you remember where they are?

Tell us in the comments section and show everyone how well you know Walnut Creek.

Bonus points if you know why the rocks are there.