The geologists worked as detectives, behind clues that could explain the bizarre features at the valley. At first, it seemed to be related to rivers that may have come through the valley. But there were somethings that could not be explained by a river action, like de giant puddles.
The other hypothesis that would explain that would be ice. A slow-moving ice originated from the last Ice Age would explain the valley formation. However, the ice sheets that flowed down from Canada during the last Ice Age never reached the Scablands.
The last theory, the most outrageous, said it was a result from an enormous catastrophe that happened almost overnight: a single giant flood, resulted from the rupture of a ice dam in the Glacial Lake Missoula.
More than one megaflood may be happened. Ice dams collapsed and re-formed in a cycle that rocked the Scablands again and again.
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| Drumheller Channels. Source: http://upload.wikimedia.org/wikipedia/commons/5/55/Drum-Heller-Channels.jpg |
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