Apr 22, 2022
SUMMIT STORIES Spring is a great time to visit Mount Diablo State Park. If you go to the top, have a look at the rocks used to build the summit visitor center. You can easily see fossils of oysters and clams—and, in the sand in between, clues to geologic history of the entire Bay Area.
From a tour of the Mary...
Apr 8, 2022
MERCURY MINING A mine near Clayton opened in 1875 and was long gone a century later. But it and subsequent mines nearby are still causing problems.