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Hornblende-biotite granodiorite, Skeleton Creek, Camas County. [Mystery Photo for yesterday: Arrowrock Dam under construction on South Fork Boise River, July 1913. Ada County. Contact visible between granitic bedrock-cut terrace and Smith Prairie basalt.
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Hornblende-biotite granodiorite, Skeleton Creek, Camas County. [Mystery Photo for yesterday: Arrowrock Dam under construction on South Fork Boise River, July 1913. Ada County. Contact visible between granitic bedrock-cut terrace and Smith Prairie basalt.


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