Temporary Closure of Waters Around Alcatraz Island
From 7/3 to 9/22 a 500’ marine buffer zone is in effect, closing the perimeter of Alcatraz Island to all private vessels to protect nesting seabirds during America's Cup racing. Tours to Alcatraz continue as usual during the races. More »
Muir Beach (but not nearby Muir Woods) closed July 8-November 2013, but local businesses are open
Though Muir Beach is closed from July 8-November 2013 due to construction, the PELICAN INN IS OPEN. Restrooms and parking are not available at Muir Beach. 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 »
Rocks on the Move at Point Bonita: Keepers of the Light and Land
NPS Suzanne Garcia
This Rocks on the Move excursion brings students to the Point Bonita lighthouse trail, a location with both maritime and geologic significance. The high cliffs and volcanic rocks form a dramatic backdrop for students to work collaboratively to produce a simplified version of F. Leslie Ransome’s 1893 geologic map of Point Bonita. Students work in teams to answer their questions about the changing landscape of an investigation site of their choosing.
By the end of the program, students have the opportunity to recognize evidence of weathering and erosion on Franciscan Complex rocks, and to consider the reasons why some of the Point Bonita pillow lavas remain essentially unchanged from the 1870s, while other sections of trail erode and slide frequently. Students speculate on how the continued processes of weathering, erosion, human activity and climate change may impact the Point Bonita landscape in the future.
Click on the buttons on the right side of this page to take a virtual tour of the Point Bonita trail, and to see the geologic investigation sites.
To learn more about the Rocks on the Move experience at Point Bonita, view our annotated curriculum guide, with links to lesson plans and activities.
Did You Know?
The red dot on an adult gull’s lower mandible (beak) serves as a target for chicks to peck to inform their parent that they need feeding.