ANTIOCH — Coal miners from a booming early Bay Area industry lay on their sides in 3-foot-tall tunnels to scrape and hack out soft black ore with pickaxes deep inside the Mount Diablo foothills ...

The view from Buckeye Hill at Shell Ridge, a view down the Briones-to-Mount Diablo Trail to the arrow spires of Castle Rocks -- with more geologic formations in the area -- and beyond to Mount ...

The Concord Fault, which runs through Bay Area neighborhoods in Concord and Walnut Creek is in a different location than previously understood. It could produce a major earthquake in the Bay Area.

The map was made with lidar, a terrain imaging technology that uses a laser scanner carried by a light aircraft. A computer crunches the data and spits out a terrain map accurate to 4 inches.

With endless spectacular views, a historic beacon and miles of hiking trails, Mount Diablo offers plenty for outdoors enthusiasts to do. Head for the museum at the summit, take in those views, then… ...

The map is the first to show the 30-mile Diablo Trail, which crosses six different parks and has places for overnight camping, said Seth Adams, Save Mount Diablo’s land programs director.

Mount Diablo has a top reputation as the best place for East Bay mountain biking. With varied terrain and numerous trails, Diablo biking is best suited to strong intermediate cyclists.

Mount Diablo sits within Mount Diablo State Park, an ecological gem of the San Francisco Bay region.