Geologists believe these erratics arrived inside icebergs caught in a Glacial Lake Missoula flood. When the bergs grounded and melted here, the rocks were left high and dry, hundreds of miles from ...

“In this case, the energy released by the glacier flood was equivalent to the output ... At the end of the last Ice Age, Lake Missoula had an outburst that was 2,500 times larger than the ...