Tunnel to Marin Headlands Closed
The tunnel on Bunker Road from Alexander Avenue in Sausalito towards the Marin Headlands is closed for construction. Please follow the detour signs to Conzelman Road (just above the north end of the Golden Gate Bridge) to go up over the hill. More »
Muir Beach (but not nearby Muir Woods) parking lot closed June-November 2013
Muir Beach parking lot will be closed from June-November 2013 due to construction. Restrooms or nearby parking will not be available at Muir Beach during this period. Pacific Way is closed except to residents. Check back for updates or call (415)561-3054 More »
CAUTION: Post Storm Damage to Coastal Trail
The Presidio Coastal Trail segment just north of the Pacific Overlook and adjacent to Lincoln Blvd remains CLOSED indefinitely. We have posted signage to alert bicyclists and hikers and with information for safe trail alternatives. More »
Subduction Construction Game
Subduction Construction is an educational game in which players examine Franciscan Complex rocks of the Golden Gate Headlands to place them in the context of the Cretaceous Period subduction zone.
Players use high-quality, digital images of rocks from seven collection sites of the Golden Gate Headlands to record geologic data "in the field." Then they bring their rock samples to the lab and perform tests to complete the identification of the rock samples.
Players are ready to visit the subduction zone and begin "construction" once they accurately identify the rock samples. Successful placement of all the rocks starts an animation of the subduction zone, which helps players visualize the tectonic movements that formed much of the dramatic geologic scenery of the San Francisco Bay Area.
Subduction Construction is designed to take about 20 to 40 minutes to finish and must be completed in one sitting. Your data will not be saved once you quit the game. At the end of play, a certificate can be printed out to verify either completion of the game or the correctly identified rocks if the game was not played in entirety.
The game requires your monitor to be set to at least 800x600 resolution and you must have Flash version 8 or greater installed to play. If you don't see a way to start the game on the entry page, you probably need to update your version of Flash.
Hint for playing Subduction Construction:
Look at the geology map (click on "geo map" on the top green banner) to make an educated guess about which rock types may be found at certain collection sites.
Did You Know?
The endangered mission blue butterfly inhabits from the Milagra Ridge in Pacifica, to portions of the Marin Headlands. This small butterfly is an important component of area grasslands. Its host plant is silver-leaf lupine, and it is only in its mature flight stage for three weeks? More...