Tag: "sedimentary rock"

Confounding Concretions

Confounding Concretions

Not crystals, not meteorites and not fossils, concretions puzzle people who find them. Geologists find them only slightly less puzzling than the general public.

 
Geological Outings Around the Bay: Pebble Beach

Geological Outings Around the Bay: Pebble Beach

Pebble Beach is a great place to look at the deep sea floor without getting your feet wet.

 
Geologic map of Caldecott Tunnel area (credit: http://pubs.usgs.gov/mf/2000/2342/ )

A Record of the East Bay’s Past Revealed During Caldecott Tunnel Construction

If you use Highway 24 as part of your daily commute you are already familiar with the Caldecott Tunnel, which connects Orinda and Oakland, but do you know about the geology of the hills through which the tunnel was constructed?