Second Valley, the Inverness neighborhood between First Valley and Seahaven, has been a bit neglected, history-wise. “Jack Mason wrote extensive histories of Inverness but—bless his heart—virtually ignored Second Valley,” wrote historian Dewey Livingston, who is curating an exhibit at the Jack Mason Museum of West Marin History to document the neighborhood’s first 80 or so years. The valley’s initial European inhabitants ran a dairy there, starting as far back as the 1850s; it was originally…