It was the greatest flood of the past two million years, and it posed a giant scientific riddle. Series Website Upcoming Airdates No upcoming episodes scheduled. Little by little evidence mounted for an old theory that was rejected by the scientific establishment. Near the end of the last ice age, an ice dam half a mile high blocked a valley in present-day Montana. .
On the site, visitors can read an interview with scabland expert Vic Baker of the University of Arizona on this fantastic region and also explore the scablands through an interactive feature. A maverick geologist became convinced that thousand-foot-deep floodwaters had scoured out vast areas of the American northwest near the end of the last ice age. The catastrophic flood from glacial Lake Missoula, which swept across northern Idaho, Washington and Oregon, caused far more disturbance than did the Bonneville Flood. Baker's research interests are very broadly concerned with the geomorphology of the terrestrial planets, with a particular focus on flood processes. The theory, first proposed by geologist J. Thanks to James Berardinelli, ReelViews.
The Bonneville flood deposits were placed over about 20 Missoula backfloods or graded flood-laid beds and 21 more Missoula graded beds overlie the Bonneville-flood gravels. Mainstream scientists scorned his theory while he searched patiently for answers to what could have triggered such an inconceivably unhappy event. Still, we can imagine them in those landscapes, witness to an enormous lake and the horrendous floods it unleashed. Our blog is designed for easy access to both educators and the general public. This water traveled westward across Idaho, Washington and Oregon for over a week, carving the Channeled Scablands and the Columbia River Gorge, and depositing massive blocks of ice and glacial erratic rocks in Oregon's Willamette Valley, before finally emptying into the Pacific Ocean via the Columbia River.
It will make viewing the documentary a much more rewarding experience. Hurricane Katrina has triggered one of the largest flood disasters in modern U. Harlan Bretz of the University of Chicago began to explore the dusty scablands of eastern Washington in an attempt to learn more about this rather unique area and also to determine how this land was transformed over time. Use the nine Titles indexes in the Labels list or Search This Blog. At least it was during the 1920s when the geologist who first broached the idea of this megaflood was ostracized for life by his profession. This is to be compared with a maximum historic discharge in the upper Snake River of 72,000 cfs at Idaho Falls in June of 1894. Therefore, the Bonneville flood occurred some time in the middle of the 2,000 to 2500 years period during which the 40 plus Missoula floods were released.
Bretz soon came to the conclusion that the scablands were not the result of slow geological weathering, but rather the result of a massive flood that moved across the region. At several localities such as Tammany Bar near Lewiston, a tributary of the Snake River, deposits of the gigantic floods merged. Anybody interested in geologic history and flood plains in general and the science behind the geology of the Northwest in particular can not help but find viewing this program an excellent use of their time. The program features a dogged geologist sticking to his bold theory despite virtual professional banishment. Before viewing this documentary, I suggest that you visit the website, and especially the.
The release of water from Lake Bonneville was apparently initiated by sudden erosion of unconsolidated material on the northern shoreline near Red Rock Pass. Hard to imagine a flood that size. Archeologists have good evidence that people lived in North America before the end of the last ice age, perhaps thousands of years before. You may also want to visit our for more information regarding many of the programs administered by the Oregon Space Grant Consortium. Still, it's not surprising that his colleagues found the concept beyond their ken. Interactives Explore the Scablands Examine the evidence left by the violent floods.
No human ever witnessed a flood basalt in process. We hope that you will find the site useful. The response from the geological community was one of incredulity, and it took many decades before his provocative thesis was widely accepted. And the lake's sudden drainings surely flushed any fish that may have been around. When geologists put the two theories together with the observed physical evidence, it became evident that the Channeled Scablands were created by the abrupt collapse twelve thousand years ago of the ice dam holding back Glacial Lake Missoula. Ice Age Lake What would Glacial Lake Missoula have looked like before its disastrous emptyings? That may not be a forlorn hope.
At Portneuf Narrows, a canyon 45 miles northwest of Red Rock Pass, the flood is estimated to have reached a height of 400 feet. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over. It involved glaciers, volcanoes, a relatively minor river and a prodigious amount of water. His research also concerns the paleo-hydrological and hydro-climatological implications of channels, valleys and other water-related landforms on Mars. Baker is a Foreign Member of the Polish Academy of Sciences, a Fellow of the American Association for the Advancement of Science, and a Fellow and past president of the Geological Society of America. The Siberian Flood Basalt probably was triggered by an even bigger meteor impact that ended the Paleozoic nearly 240 million years ago. Mystery of the Megaflood: What unleashed a catastrophic flood that scarred thousands of square miles in the American Northwest? Finally, an ingenious solution silenced the skeptics: traces of an enormous ice dam half a mile high, which had blocked a valley in present-day Montana and created an enormous lake behind it.