Trek Through Time
Join us for a journey through 200 million years of Bay Area geologic history, from the age of Dinosaurs to the present. We’ll car caravan through Mount Diablo State Park and take several short hikes to study fascinating fossils and view intriguing land forms. From Diablo’s summit, we’ll see all nine Bay Area counties (and beyond) and learn about Greenbelt Alliance campaigns throughout the Bay Area.
Date: Sunday, December 9
Time: 10 a.m. to 3 p.m.
Rating: E 3 A
What to Bring:Wear good hiking shoes. Bring lunch, liquids, and dress warmly.
Cost: $10/vehicle park entrance fee.
Rain Policy: Canceled in the event of rain.
Directions: Meet at the Upland picnic area in Rock City at 10 AM.
From the west, including Berkeley, Oakland, and SF, follow Route 24 through the Caldecott Tunnel toward Walnut Creek. Take 680 North and exit immediately onto Ygnacio Valley Road. Turn right on Ygnacio Valley Road and follow it east to Oak Grove Road. Turn right. Follow Oak Grove Road to North Gate Road, and then turn left on North Gate Road. Take North Gate Road and head into the park. Continue to the Junction Ranger Station. From there continue on South Gate Road for about 2 ½ miles to Rock City.
From north of Walnut Creek (Pleasant Hill, Concord, or Highway 4), follow 680 South, exit Treat Blvd. and follow Treat Blvd. east to Oak Grove Road. Turn right on Oak Grove Road. Continue on Oak Grove Road after crossing Ygnacio Valley Road continuing to North Gate Road. Turn left on North Gate Road and head into the park. Continue to the Junction Ranger Station. From there continue on South Gate Road for about 2 ½ miles to Rock City.
From the South (Tri-Valley area), take Interstate 680 North. Exit on Diablo Blvd in Danville traveling to the east. Diablo Road makes several turns en route to Mt. Diablo Scenic Drive (South Gate Road). Continue on Diablo Road past a fire station on the right until you reach Mt. Diablo Scenic Drive. Turn left and follow this road into the park. Rock City is on your left about 1 mile past the South Entrance Station.