Grand Coulee Columbia Rivers pathway and onto the southern plateau creating an ice dam. This dam backed up the waters of the Columbia into Glacial Lake Columbia and later during the Missoula Floods forced those waters into eastern Washington, creating the Scablands. The river at Grand Coulee found no existing valley and thus forged its own pathway across the divide, creating the Upper Coulee. The plateau is not level, but is marked with wrinkles and upfolds of the basalt. The diverted waters of the Columbia, encountered the monoclinal flexure, a steep warping up of toward the northwest. Lake Columbia topped the ridge
Buzzard Coulee meteorite about the size of a desk and have had a mass of approximately 10 tonnes. The village of Marsden, Saskatchewan became a hub of activity for meteorite hunters, being just south of the estimated 20 square kilometre debris field. Locals dubbed the object the "Marsden Meteor"; many of the residents reported seeing, hearing and even smelling the burning fragments as they fell. The meteor was also referred to as the "Buzzard Coulee fireball", named after the area where searchers found the first fragments. Buzzard Coulee is located approximately from the Battle River valley. The first pieces of the rock were