I find this image kind of amazing, looking almost as if a landscape--or the old wrinkled skin of an elephant--were projected onto this boulder, a la Abelardo Morell. And then also the manner in which it sits there, looking rather like the head of animal and rather precariously balanced, hence the "cradle" I guess.  I've found a few other images of Cradle Rock out there, but none that make it look anywhere close to as special as this photograph does, to my eye really a beautiful one.

3 1/2" x 5 5/8" and in good condition, with cradle rock Groveland ma written in panecil at upper right. Early 20th century I believe. Some foxing on the blank postcard back.