Come explore how Spokane’s geological history helped shape its architectural identity on this fascinatingly unique Native Rock Tour. Tour sites include the following historic places: Glover Mansion, Westminster Congregational Church, C.C. Koerner House, Ralston & Sarah Wilbur House, Vera Water and Power Well House, Blakely Gardens, and Royal Riblet Mansion Grounds.
Rocks and stone are some of the most ancient and durable of building materials, and Spokane County’s granite, basalt, and cobblestone structures and landscapes are visible reminders of our fire and ice past. Ancient Precambrian granite outcroppings in the county were excavated for an extremely tough, stable stone that required a high level of skill to shape. The huge Columbia River volcanic eruptions 17 to 6 million years ago covered the area with thick layers of basalt – a readily-available source of building and landscaping material. Later Ice Age floods deposited numerous rounded cobblestones which were made into eye-catching structures prominent in the Spokane Valley.