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What are the principle rocks of the Franciscan formation?

The Franciscan primarily consists of graywacke sandstone and argillite, but also contains lessor amounts of greenstone (altered submarine basalt), radiolarian ribbon chert, limestone, serpentinite (altered mantle material), and a variety of high-grade metamorphic rocks such as blueschist (high-pressure), amphibolite,

What is the Franciscan series of geology?

The Franciscan Complex is dominated by greywacke sandstones, shales and conglomerates which have experienced low-grade metamorphism. Other important lithologies include chert, basalt, limestone, serpentinite, and high-pressure, low-temperature metabasites (blueschists and eclogites) and meta-limestones.

What is the geology of the Golden Gate National Park?

The Golden Gate Highlands National Park is underlain by stratigraphic units belonging to the upper part of the Karoo Sequence. These units include part of the Beaufort Group and the Molteno, Elliot, Clarens and Drakensberg Formations.

What is the Franciscan formation chert?

Many Franciscan chert beds are highly folded and contorted, but within a short distance they often appear to be unfolded. Some scientists believe that this type of folding is the product of the slumping of the soft gelatinous silica-rich sediments, contorting them before they are fully hardened into rock.

What is the geology of the Marin Headlands?

The primary rock types of the Marin Headlands include graywacke sandstone, radiolarian chert, serpentinite, pillow basalts, and shale. These rocks began their migration over one hundred million years ago from as far south as present-day Los Angeles.

What are the Franciscan rocks of the coast ranges?

The core of the range is made up of rocks of the Franciscan Complex, flanked by Coast Range ophiolite (CRO) and Great Valley sequence (GVS). The Franciscan Complex in this area consists of deformed and metamorphosed sedimentary and volcanic rocks containing fossils of Late Jurassic to Late Cretaceous age.

What is the geology of the San Francisco coast?

The geology you see around San Francisco is the result of forces along the Pacific and North American plates. Today, the Pacific Plate is slowly creeping north past the North American Plate, forming the San Andreas fault system. San Francisco Bay was created by movement on these faults about 650,000 years ago.

What is the Franciscan rock formation?

The Franciscan Formation (the type section of which is located in the city of San Francisco) is a unique complex of diverse igneous, sedimentary, and metamorphic rock types that formed between 200-80 million years ago.

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