New geoblogger Ryan Brown over at Glacial Till didn’t take long to find WoGE #212, and since he was kind enough not to put a Schott Rule on it I was able to return the favor and quickly identify the lovely barchan dunefield encroaching on the estuary of the meandering Rio Preguiças that he chose for WoGE #213.
For WoGE #214 I’ve selected a rather large area (by WoGE standards), so I expect it won’t be too hard to locate. Thus, I will choose to invoke the Schott Rule (please wait an hour for each WoGE Win you’ve got before answering). The real challenge in this one will be encapsulating the very interesting geologic story contained in this otherwise unassuming Google Earth image. I’m looking for more detail than just a one line geologic description (but don’t feel compelled to write a thesis before identifying the location and claiming the right to post WoGE #215). One or two of you may even have field photos from this region (please share!) if you’ve been lucky enough to visit it on research or a field trip…
Post time: 13 Oct 2010, 08:50 Central Daylight Time (USA) – 13 Oct 2010, 13:50 GMT.
Rather than rushing to post WoGE #214 (look for it tomorrow), I want to take a couple of minutes to post a couple of landslide GigaPans that I had originally intended to post back in September to go with that month’s Landslide theme on Pathological Geomorphology.
The two slides that I want to highlight happened about 34 years apart and are located just outside the boundaries of two of America’s most visited national parks.
On or about June 23, 1925 about 38 million cubic meters of rocks and debris slid northward off of Sheep Mountain and into the valley of the Gros Ventre River, forming an impoundment that now holds back Lower Slide Lake. Almost two years later a portion of this landslide dam failed and the resulting flood wiped out the town of Kelly, Wyoming killing six people. In this GigaPan you can see the upper scar of the slide on Sheep Mountain and some of the debris that is still only sparsely vegetated over 80 years later.
On August 17, 1959 the M7.5 Hebgen Lake Earthquake triggered a massive landslide that blocked the drainage of the Madison River and formed the modern day Quake Lake. This 360 degree panorama is shot from atop the landslide deposit. To the south one can see the landslide scar on the facing ridge. All around the camera location are the blocks of bedrock displaced during the slide – some that ran up the hill opposite the landslide scar are the size of small houses.
Driving back towards Yellowstone, I paused for one last view back across Quake Lake…
Brian Romans of Clastic Detritus may be on the road, but I’m gonna do my best to summon his spirit on this first day of Earth Science Week 2010. Brian, of course, was responsible for originating Where on (Google) Earth, two blog incarnations and many moons ago. Brian also traditionally brings us a weekly Seafloor Sunday post, and lest we all go into deep withdrawal on both of these counts, I propose to kill two birds with one stone.
Furthermore, Where on (Google) Earth?s have also been a fairly reliable way for me to get my own blogging juices flowing, and since WoGE #211 was solved but has lain fallow for almost two months now, I’m exercising my authority as keeper of the official list of WoGE Winners to revive and resuscitate one of the Geoblogosphere‘s longest running institutions. Since it’s been so long, it’s worth reminding everyone that the object of Where on (Google) Earth is to identify the locality of the image below (latitude and longitude will generally suffice), but also to explain the geological significance of the site. Since very early on it has been the tradition for the winner (first person to correctly identify the location and geologic significance of this WoGE) to host the next challenge on their own geoblog. If the winner has no geoblog, then they are hereby responsible for starting a brand new geoblog of their own – it’s really not that hard, just ask if you need assistance. (Seriously, don’t bother playing if you’re not willing to shoulder the responsibility of hosting the next challenge. We don’t need to see this valuable institution disappear into oblivion again.) The winner is further responsible for posting a link to the next challenge in the comments of the previous one as soon as the new challenge is posted. In this way we are able to maintain a chain of links to the most current incarnation of WoGE.
I think WoGE #212 will be relatively easy to locate, so I’m choosing to invoke the Schott Rule – wait an hour for each WoGE you’ve won before answering, please. Post time: 10/10/10, 23:10 Central Daylight Time (USA) – 11 Oct 2010, 4:10 GMT. (The Schott Rule is invoked at the discretion of the geoblogger who posts the new WoGE. Easy challenges generally merit a Schott Rule invocation, whereas more challenging ones generally do not. The main purpose of the Schott Rule is to allow new competitors a fair chance to participate by keeping previous winners from dominating the game.)
And now, I’m off to sleep with the fishes!