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Golden Gate National Recreational Areaphotos of historic people associated with Golden Gate
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Golden Gate National Recreational Area
Special Events After-Hours on Alcatraz Island
Ribbon chert beds  

Did You Know?
It takes about 1,000 years of radiolarian “rain” to produce a layer of ribbon chert just one millimeter thick.

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Last Updated: October 02, 2007 at 16:30 EST