Sharing the Fascinating Ice Age Floods Story Since 1995
A large number of important articles get buried over time as new articles are added to our website, so here’s a chance to review and relive some of our most important articles. We think you might enjoy reviewing these timeless features.
Check out this video about the Washington 100, a cool new geotourism website by the Washington Geological Survey featuring 100 places to experience amazing geology in Washington State. Then explore the website itself at wa100.dnr.wa.gov
Do you ever hear the Led Zepplin song “Kashmir” in your head when contemplating the Ice Age Floods? “I am a traveler of both time and space. To be where I have been” –Robert Plant, Led Zepplin’s Kashmir My 11-year old daughter and I are on a 5-day, 4-night raft trip on the Lower Salmon river and we are having the time of our lives! Sun, sand, water, lovely food, games and some of the finest nicest Eastern Oregonians we have ever met. One of the guides is a sensitive and strapping young man who is a student at U of Oregon. He’s both an English major and a Geology major. What do you with that? You write about the soul of the earth, true love and adventure, river stories, deep thoughts that cross scientific paradigms. I see him becoming a teacher someday, maybe a science teacher like his Dad. And he’s a kayaker like me. What is so amazing about the Eastern Oregon guides is their familiarity with, connection to, and love of the river and land. They don’t fight traffic or get on the morning commute treadmill every day. There are no stoplights in the whole of Wallowa County, and the only food franchise is a Subway sandwich shop, no Costco or Walmart. Sure, they have school and work, but they are connected to and love the land they live on in deeper ways that us city folks miss. They are here to tell us about the land. They are guides. The 4th day on the river we pass a group of pillar-like rocks with beautiful symmetry. “That’s columnar basalt” my guide says, “The geologist who figured out the floods and travelled around these parts was J Harlan Bretz”. “J Harlan Bretz” I repeat, carefully, committing to memory. When I returned home to talk to my friend (who was a geology major at Wesleyan) about the trip, she replies “’J Harlan Bretz,’ Oh yes, I have all his books!” An Amazon search and I begin by reading a biography of J Harlan Bretz, “Bretz’s Flood” by John Soennichsen- (some guy from Eastern Washington… hmmm). And guess what: It’s so well-written, I can’t put it down! I am enthralled cover-to-cover with the character of J Harlan Bretz, his teaching method of taking students to the field (and floating them downstream on large Sequoia logs, upon occasion), his love of life, the serendipity of his study of the USGS Quincy Basin topo map when it first published, many summers spent driving around and measuring the Channeled Scablands, presenting his field evidence and theories at the Cosmos Club in Washington DC, and most of all his ability to KNOW he was RIGHT when all his colleagues scoffed and dismissed his theories. Now THAT man was a pillar of strength. Perhaps like a column of basalt? If he were alive today, Harlan Bretz could stand up to money-motivated physicians – the bad kind, nepotism in the school district, gossipers and bullies, and other types of corruption, all of which I have had to do to defend my younger child against since. J Harlan Bretz helped me to do this. He was a GREAT man! “All I see turns to brown.. And fills my eyes with sand as I try not see the wasted land” – Kashmir by Led Zepplin What was it about those floods, biblical in nature, that left behind a story of such jaw-dropping inspiration? Who are these people who live in Eastern Oregon and Washington and are so inspired by the landscapes there they are called to find new ways to study it, publish, write fantastic biographies? I continued my search to find other scholars of the Ice Age Floods, and that led me next to Nick Zentner and Bruce Bjornstadt. To be continued…
Have you ever thought about the how the weight of the ice-age Cordilleran ice sheet might affect the underlying Earth’s crust. There is strong evidence that the crust was depressed hundreds of feet beneath the ice, and since the crust is relatively thin and rigid over a plastic aesthenosphere, that also caused the crust for some distance beyond the ice margins to tilt toward the ice sheet. A new modeling study explored how changes in topography due to the solid Earth’s response to ice sheet loading and unloading might have influenced successive megaflood routes over the Channeled Scablands between 18 and 15.5 thousand years ago. The modeling found that deformation of Earth’s crust may played an important role in directing the erosion of the Channeled Scabland. Results showed that near 18 thousand year old floods could have traversed and eroded parts of two major Channeled Scabland tracts—Telford-Crab Creek and Cheney-Palouse. However, as the ice-age waned and the ice sheet diminished 15.5 thousand years ago, crustal isostatic rebound may have limited megaflood flow into the Cheney–Palouse tract. This tilt dependent difference in flow between tracts was governed by tilting of the landscape, which also affected the filling and overspill of glacial Lake Columbia directly upstream of the tracts. These results highlight one impact of crustal isostatic adjustment on megaflood routes and landscape evolution. Other studies have shown that relative ice-age sea levels were over 300 feet lower worldwide due to the volume of water locked up in ice sheets. Typical depictions of the shoreface extent are generally based on a 300 ft. depth contour, but there is strong evidence that shorelines were up to 200+ ft. higher than present day in marine areas adjacent to ice sheets, again because the crust was depressed by the weight of the ice sheer. A more accurate representation might show a much narrower shoreface in ice-free areas nearer to the ice sheet margin. However, in the Haida Gwaii Strait at the margin of the ice sheet the lower thickness of the ice sheet meant that local shorelines were as much as 550 feet lower than they are today. This was because the much greater thickness of the center of the ice sheet served to push upwards areas at the edge of the continental shelf in a crustal forebulge. It is now widely thought that these emergent ice-free land areas might have provided a viable coastal migration corridor for early peoples making their way to the Americas from Asia during the Pleistocene.
Dry Falls Kayaking Ice Age Floods National Geologic Trail Most Pacific Northwesterners know how awesomely majestic and stunningly beautiful Dry Falls is, if only from the pictures that seem to show up everywhere. If you haven’t been there in person yet you definitely need to make that trek into central Washington. The drive through the lower Grand Coulee, as awesome as it is, is only the teaser for the view from the Dry Falls Visitor Center. But if you really want to get into the majesty, consider taking a kayak down to Dry Falls Lake or Deep Lake, at the base of those monstrous cataracts. The dirt road to Dry Falls Lake isn’t for the faint of heart, and a good, high clearance SUV is recommended. But paddling the lake near the base of those 400 foot high cliffs is worth the effort. Bordered by reeds and accompanied by waterfowl, an hour-long paddle around the lake is leisurely, relaxing, and totally absorbing. And who knows, you might end up in someone else’s fantastic photo of Dry Falls from the Visitor Center. The road to Deep Lake is paved, so it is a much easier place to get to. And the ramp at the lake makes getting in and out pretty easy… just be careful of the slippery algae on the ramp. Once you’re on the lake an hour’s paddle will take you from an area bordered by rolling hills to a section bounded by high vertical walls. Don’t fall out in this area because there’s nowhere to climb out or beach your boat to climb back in. Still, it’s astoundingly interesting to get up close and see the variety of textures in the basalt walls. Of course, you can also do some great hiking in both areas, though climbing the blade takes quite a bit of effort and confidence, but the view is pretty spectacular. Unfortunately, the way back down isn’t any easier than the way up. Choose your route carefully. Quick Facts Location: Grant County, Washington, United States 99371 MANAGED BY:Washington State ParksWebsite: https://iafi.org/go-do/washington/ Dry Falls is a 3.5-mile-long scalloped precipice with four major alcoves, in central Washington scablands. A Discover Pass is required for vehicle access to state parks for day use. For more information about the Discover Pass and exemptions, please visit the Discover Pass web page.
On Friday,July 8 around 2:45 p.m., British tourist Harry Shimmin reached the highest point in his trek along the Jukku pass in the Tian Shan mountains in Kyrgyzstan. He separated from the group to take pictures from the edge of a cliff when he heard deep ice cracking behind him. He turned around to an avalanche of glacial ice and snow rushing toward him and within moments found himself in a blizzard. The avalanche was the second glacier collapse of the week, demonstrating the perils of human-caused climate change amid a blistering hot summer in parts of Europe and Asia. These are glacier ice avalanches, rather than primarily snow, in which a glacier broke off and collapsed under the force gravity. The high density of ice added speed and weight to the avalanche. In the Tian Shan event, glaciologist Peter Neff, of the University of Minnesota, pointed out that there was no apparent snow around the mountain so the avalanche was largely a solid chunk of glacial ice. In high mountain regions with permafrost, warm temperatures not only destabilize the glacier ice but also the density of the ice around it. “It’s very dense, more like a landslide than an avalanche,” he said. “The British trekker is indeed, as he is aware, very lucky to be alive in the case of the Kyrgyzstan event,” added glaciologist Jeff Kargel, a senior scientist at the Planetary Science Institute. “A pretty solid hypothesis is that as temperatures warm [and] climate warms, the amount of melting increases,” Kargel said. “The effects of meltwater on destabilizing ice masses increases, and so the number, the frequency and magnitude of glacier ice avalanches should be increasing … and that does seem qualitatively to be the case.” Daniel Farinotti, a glaciologist at ETH Zurich, agreed. “It is long known that meltwater caused by high temperatures increase the pressure in the glaciers’ subglacial drainage system, which in turn can accelerate glacier motion,” said Farinotti in an email. “This increase in pressure and motion have certainly a role to play in such collapses.” Among the greatest downstream effects from such mountain glacier loss and collapses are on fresh water systems, Neff said. For instance, glaciers in High Mountain Asia play a critical role in funneling freshwater into river basins used for drinking, irrigation and hydropower by nearly 1.5 billion people. From the Washington Post article by Kasha Patel
Bruce Bjornstad is at it again with his awesome Ice Age Floodscapes drone videos, this one from Frenchman Coulee. Watch it below and visit his Ice Age Floodscapes YouTube channel.for many more.
Archaeologists have long debated how and when people entered the Americas. Throughout the 20th century, the mainstream hypothesis was that the Clovis people were the first to pass into Alaska about 13,000 years ago. Stemming from his excavations between 1977 and 1987 at the Bluefish Caves in northwestern Yukon, Jacques Cinq-Mars, a Canadian archaeologist, unearthed evidence that hunters were using the site some 24,000 years ago. Lauriane Bourgeon, a French archaeologist, has spent much of her career re-examining and dating the Bluefish Caves collection to clarify the history of the contentious site. Her research has shown that at least 15 bones from the Bluefish Caves were cut-marked by people as early as 23,500 years ago.
Analysis of how long erratics have been exposed on ice-free ground in the hypothesized “Late Pleistocene ice-free corridor migration route” suggests that route was not fully open until about 13,800 years ago, and the ice sheets “may have been 1,500 to 3,000 feet (455 to 910 m) high in the area where they covered the ice-free corridor,” according to study lead author Jorie Clark, a geologist and archaeologist at Oregon State University. Clark said, “we now have robust evidence that the ice-free corridor was not open and available for the [Late Pleistocene] first peopling of the Americas.” If evidence of humans in the Americas prior to the 30,000 years ago is ultimately found, that evidence does not preclude the possibility of ice-free corridor migration before closure of the corridor.