Unlithified Silt, clay, and sand deposits in coastal bluff

            This is sediment in the bluff above the beach at Fort Funston, San Francisco, CA.  There was a patina of loose sand over the whole surface, which had to be removed before students could study the material behind. 

The clear exposure across the center of this shot is where we broke off a protrusion to see a fresh break.  These pink/beige deposits are quite fine textured - silt or clay - with a lighter sand bed then a darker reddish sand bed.  There is a thin iron-rich layer between the sand beds.

This was probably a tide-influenced environment with the fine layers deposited during slack times. Perhaps lenticular bedding?

Taken in: United States / California / San Francisco (show map)

Taken on: April 20, 2016

Tags:

Montara Beach

California Coastal Geology

Geology

Sediment

High school

Geology class

San Francisco

Clay

Silt

Deposits « less

Sets appears in: • Student Activities and Projects • EARTH - Geology & rock stuff

Groups appears in: • Geology Rockers • Coastsider more » • Geology Flickrs • California Coastal Geology • Global Coastal Geology; Geología costera global; Géologie côt « less

Camera: NIKON COOLPIX AW120, f/2.8, 1/125 sec, 5.1mm, ISO 125 (more info) (hide info)

Camera:	NIKON COOLPIX AW120
Aperture:	f/2.8
Exposure Time:	0.008 sec (1/125)
Focal Length:	5.1mm
ISO:	125
Exposure Bias:	0 EV
Flash:	Auto, Did not fire
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	COOLPIX AW120V1.0
Show full info

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