The Marin Headlands contains abundant exposures of a rock of biological origin, radiolarian chert. Over eons, innumerable skeletons of this tiny phytoplankton slowly rained down to the ocean floor to form the chert layers that underlie about half of the Marin Headlands.
What is the geology of Fort Funston?
Fort Funston sits on a bluff made up of soft, sedimentary rocks that are part of the Merced Formation, a sedimentary deposit formed in a basin along the San Andreas fault during the Ice Ages of the last three million years.
What is the geology of Golden Gate park?
Most of the basement rocks in the park belong to the Franciscan Complex. These rocks were originally deposited in a marine environment in a sequence beginning with basalt and greenstone, followed by chert and limestone, and finally graywacke sandstone and shale.
What is the geology of the Arches National Park?
The vast majority of arches in Arches National Park are within the Entrada Sandstone, including at Devils Garden and Klondike bluffs. Grains in the Entrada Sandstone are nearly spherical, creating a very porous (full of tiny spaces) rock.
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Elder, W. P., 2001, Geology of the Golden Gate Headlands: in Geology National Park Service, [2010], Geology Resources - Golden Gate National Recreation Area:
Geologic Activity - Golden Gate National Recreation Area
Oct 13, 2022 Younger rocks in the park are linked to sea level rise and fall during past glacial periods. The Merced Formation forms the sea cliffs at Fort
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