Golden Gate Geology, California
Posted by: Groundspeak Premium Member Queens Blessing
N 37° 49.614 W 122° 29.953
10S E 544070 N 4186727
Quick Description: This informative sign was placed by the Golden Gate National Recreation Area organization, on Hawk Hill, overlooking the Golden Gate Bridge.
Location: California, United States
Date Posted: 2/27/2011 12:49:38 PM
Waymark Code: WMAVF5
Published By: Groundspeak Premium Member RakeInTheCache
Views: 22

Long Description:
The text on the sign reads:

"Golden Gate National Recreation Area

Golden Gate Geology

Deep sea rock high in the headlands

The headlands on both sides of the Golden Gate are composed of ancient oceanic rock pushed to the earth's surface--chert, serpentinite, basalt, and graywacke sandstone. Especially hard and weather-resistant, chert forms the ridgelines.

The rocks you are standing on once resided on the bottom of the Pacific Ocean. The sedimentary rock consists largely of the skeletal remains of minute marine organisms, radiolaria, deposited layer upon layer on the seafloor over the course of millions of years. Scientists believe the radiolarian chert, as the rock is known, and the entire headlands complex, was forced to its present position over millions of years by a collision of the continental and Pacific plates.

Since chert is mostly composed of radiolaria fossils, its layers tell us the origin of these rocks. It takes about 20,000 years for one inch of chert to develop. The radiolaria in these rocks are tropical species from the equatorial Pacific which lived millions of years ago."
Waymark is confirmed to be publicly accessible: yes

Access fee (In local currency): .00

Requires a high clearance vehicle to visit.: no

Requires 4x4 vehicle to visit.: no

Public Transport available: yes

Website reference: [Web Link]

Parking Coordinates: Not Listed

Visit Instructions:
No specific requirements, just have fun visiting the waymark.
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