Chert spheroid in Monterey Formation along Kelham Beach

alt="Chert spheroid in Monterey Formation along Kelham Beach in Point Reyes National Seashore. Along with obsidian and quartz, chert was used by Native Californians to fashion sharp-edged tools and weapons. Photograph by Brett Valle’." border="0">

Chert spheroid in Monterey Formation along Kelham Beach in Point Reyes National Seashore. Along with obsidian and quartz, chert was used by Native Californians to fashion sharp-edged tools and weapons. Photograph by Brett Valle’.

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