Along the Spokane River, and you can find geological potholes. These potholes have been drilled out slowly by erosive power of the river and the sediments that scrape along its riverbed. Sediments become trapped, collect in the depressions of the rock, and get pushed around in circles. Over time, these loose sediments act as a drill tool, gradually eroding away at the depression, causing it to widen and deepen. Geologists associate potholes with large volumes of very turbulent water. Most often they are thought to be associated with the melt water of a glacier.
To claim a find for this earth cache, you must make a thorough examination of the area around the published coordinates, and provide answers to the questions below to the cache owner via the email link in our profile.
1) The potholes in this area were probably formed as result of _______________?
2) What are your observations about the pothole itself? (how big, colors, layers, etc.)
3) What about this location helped to create the potholes?
Pothole illustration by Mr. Robert Gamesby, Head of Geography, St. Mary's Catholic School, Newcastle upon Tyne, UK