A
Touchet beds, which consist of distinct rhythmite deposits with an approximately 55Â­year periodicity, are evidence for the existence of one of these features in the late Pleistocene. Geologist J. Harlen Bretz was the first to hypothesize that one of these phenomena was responsible for unusual erosional features in the Grand Coulee. Diluvium is the name given to deposits by these phenomena. These phenomena generate kolks, which in turn leave evidence of lakes in pluckedÂ­rock basins, such as those at the region below Dry Falls. A (*) jÃ¶kulhlaup ("YOÂ­kulÂ­hloip") is one of these phenomena that results from a subglacial volcanic eruption. The barren and soilÂ­free nature of the "channeled scablands" in the Columbia river plateau is due to a series of these events, which were caused by the rupturing of an ice dam in the Cordilleran ice sheet. That led to the outflow of glacial lake Missoula across eastern Washington. For 10 points, name these catastrophic events in Quaternary history, overflows of water that submerged dry land.
Touchet beds, which consist of distinct rhythmite deposits with an approximately 55Â­year periodicity, are evidence for the existence of one of these features in the late Pleistocene.
floods