From East Bay Regional Park District:

BLACK DIAMOND MINES REGIONAL PRESERVE - Lichen are fascinating organisms we find here at Black Diamond, with unique structures and characteristics that support each other and the ecosystem around them. Join us to learn about their importance in our ecosystem!

Meet in the upper parking lot, which is a mile past the kiosk.

Black Diamond Mines (Antioch): Upper Parking Lot

http://goo.gl/maps/jPYOx

$5 per vehicle parking fee applies when kiosk is attended.

No-registration required; Drop-in Program only.

For more info, visit: https://anc.apm.activecommunities.com/ebparks/activity/search/detail/55993?onlineSiteId=0&from_original_cui=true