- This creek is not defined on OpenStreetMap. It is defined as a GNIS feature, which shows the creek runs from east-west, draining into Lake Roosevelt (a lake of the Columbia River). The creek may be diverted or dried, investigation needed. Note that switching to a topographic view in OSM will show the terrain likely created by the creek.
- Sandstone (Wikipedia)
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks.