#roadcut

[relatetorocks]

[mallycat13]

September 2, 2020: Road cuts #roadcut #roadtrip #geology #geologyrocks #geologyfieldtrip #boysenstatepark #wyoming #explorewyoming #blackandwhite #blackandwhitephotography #2020vision #hindsights2020 #leapyear #366photochallenge #366dayphotoproject #apictureaday #ramostfamous (at Boysen State Park) https://www.instagram.com/p/CEpwXZEhATR/?igshid=1hqqkoqqtkix2

[azero]

excavated rock #roadcut #himachalpradesh #india (at Mandi, India) https://www.instagram.com/p/BqD-40RFzAE/?utm_source=ig_tumblr_share&igshid=unvkwklgrokd

[mallycat13]

Road cuts are my favorite!! #roadcut #geologyrocks (at Kerrville, Texas) https://www.instagram.com/p/Bo2tRKzBrQb/?utm_source=ig_tumblr_share&igshid=13e8uwubqn2or

[wigmund]

From Earth Science Picture of the Day; September 20, 2018:

Washington Roadcut and Mount Mazama Ash Photographer and Summary Author: Rebecca Roush

Mount Mazama was a cluster of volcanoes in central Oregon that were destroyed during a series of ancient, massive eruptions. An eruption 7,700 years ago created a 30-mi (48 km) high column of pumice and ash. Note that the height of this column is estimated based on, among other factors, the volume and distribution of the ash deposits. Winds carried this ash across much of the Pacific Northwest, including to this roadcut on the North Cascades Highway, near Diablo Lake, Washington. The amount of ash distributed by Mount Mazama was over 40 times greater than the ash from the 1980 eruption of Mount St. Helens. Thus, the resulting ash layer that formed from Mazama's explosive eruption is sufficiently thick to be used as a geological time marker by geologists. Photo taken on June 22, 2018.

Photo Details: Camera: HTC 0PJA2; Exposure Time: 0.017s (1/60); Aperture: ƒ/2.2; ISO equivalent: 80; Focal Length: 4.7mm.

Diablo Lake, Washington Coordinates: 48.714167, -121.131111

Related Links

Ash Layer in Roadside Cut

Mazama Ash in Montana

Ash from Crater Lake Volcanic Eruption

Student Links

Geology and History Summary for Mount Mazama and Crater Lake

Why Study Cascade Volcanoes?

Earth Observatory

North Cascades National Park

[wheretofindrocks-blog]

#rattail #smoky #quartz #crystals from #magnetcove #arkansas #roadcut #mineralcollecting #mineralspecimen #rockhound (at Magnet Cove, Arkansas)

[quasarlasar]

IN WHICH I VISIT THE BIG GUY HIMSELF—PART 3: (ROAD) CUT TO THE HEART

The infamous “Palmdale Roadcut,” shown in many popular articles and textbooks, is shown in the top two images. It is a cross-section of part of the San Andreas Fault zone that has some really contorted rock layers in it. You can see how the once horizontal layers have been tilted vertically and even folded to the point they overturn! Can you imagine the kinds of forces that had to act over millions of years to do that to solid rock??!

I have to admit, however, it looks way more colorful and defined in the infamous photographs than it does in person. In textbook pictures, the rock layers are portrayed as alternating in vivid brick-red, straw, and steel grey. In reality, the colors are kind of muted and faded. Oh well. 

Third image is a picture taken standing on a fault scarp and looking down. This scarp is now a winding hill, but when it first formed in the 1857 earthquake, it was actually steep and vertical. Now, more than 150 years later, it doesn’t stand out much from the rest of the hills and valleys around it.

The final two images are one side of Leona Valley, which encompass the fault zone itself. Essentially the valley is part of the San Andreas Fault, and exists because the fault’s rocks are broken and fractured, and thus easily eroded. I couldn’t take a picture of both sides because I’d need to be crossing a highway, but you can sort of imagine what the other side would look like.

Aside from the roadcut, these landscapes seem very tranquil. You’d never guess that you were walking straight through the heart of the San Andreas Fault.

Most of the people here are probably completely unaware of that.

[furiouskitten]

The infamous I-70 roadcut west of Denver near Morrison, CO. On both sides of the hogback there are spots to see dinosaur footprints. (Tbh my favorite part of this roadcut are the colours.) #geology #rockpic #roadcut