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’.


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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