Jasper Ridge Biological Preserve

It is located at 37°24′29″N 122°13′39″W / 37.408°N 122.2275°W / 37.408; -122.2275[4] south of Sand Hill Road and west of Interstate 280 in Portola Valley, San Mateo County, California.

This rock was squeezed toward the surface by tectonic plate movement, and thus feels greasy, as it has been polished over millions of years.

More recently, the oak/madrone forest is being succeeded by specimens of large Douglas fir (Pseudotsuga menziesii) as in the image above.

In addition there are several groves of second growth Coast Redwoods (Sequoia sempervirens) in the preserve, some in large "fairy rings" indicating that trees of immense girth were cut down in the nineteenth century.

It is home to office space for staff, a laboratory for research, the Jean Lane Environmental Education Classrooms, a reference library, and the Oakmead Herbarium.