Set on a bluff overlooking the Columbia River approximately 350 feet north of St. Paul’s Mission near Kettle Falls, WA is a natural and historic object seeming out of place amidst a landscape of dense Ponderosa pine forest. Large, off black in color, uniquely shaped, and weighing over a ton, the Sharpening Stone is a mute testimonial to a time when the river ran free, its banks were lined with native fisherman.
Comprised of amphibolite, the geological composition is more fine-grained than the local bedrock, indicating this boulder is not from this area. Geologists have two theories of how this boulder came to the bank of the Columbia River. The first is that a large glacier deposited the boulder as it receded. The second is that the massive rock was carried by one of the cataclysmic Ice Age floods that swept through eastern Washington
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