300 million year old rock made of organism skeletons!

Radiolarian chert in San Francisco overview

The MS 141 Geological Oceanography class traveled to the Marin headlands to visit many rocky outcrops.  The folded rock near rodeo beach San Francisco was most impressive.  This rock was around 300 million years old.  Composed of layer upon layer of radiolarian skeletons, tiny creatures with mineral bodies that get left behind, the outcrop has layers that span millions of years that have since been down-lifted, compressed and uplifted.  This is some rock that rocks!

Professor Ivano Aiello speaking about the radiolarian chert and how the outcrop was formed around 300 million years ago.

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