#geolgoy

[rabbitcruiser]

Wet Desert

What do you think about my pic?  

[tt-squid]

the thing is. playing minecraft with respect to geolgoy is like?

oh. i should put a river here thatd be cool BUT WAIT now ive gotta add a submarine fan into the mix as well!!! and consider how the river source come to be and just!!

and like!! i dont have the time for that!!!

[earthstory]

Waterpocket fold This image captures one of the dominant geologic features of Capitol Reef National Park and was shared by the US Geological Survey. This is the Strike Valley Overlook, which has a view along the layers on the side of Waterpocket Fold.

The Waterpocket Fold is an anticline, a geologic feature formed when rocks are folded upwards. You may note that this is a valley, a surprising landform to find if the rocks have been folded upward, but there is one more detail that controls the shape of the valley we see. When rocks fold bend, the rocks at the hinge of the fold are put under stress. The rocks at the widest part of the fold are pulled apart and the rocks at the core of the fold are squeezed. Both of these cases – rocks under tension and compression – can cause the rocks to fracture. When cracks form, water can get into the rocks and erode them away. Large anticlines commonly are found with their cores eroded away because those rocks are fractured and easily eroded, while the tilted hinges remain in tact as exposed, dipping layers, just as seen here. The exposed rocks are Jurassic and Cretaceous aged sedimentary rocks, marking times from when the U.S. Southwest went from being a desert filled with sand dunes to a time when it was submerged beneath the waters of an inland seaway. -JBB Image credit: USGS/Ida & Leo https://flic.kr/p/wYcF4x Read more: http://www.nps.gov/care/learn/nature/geology.htm

[just-a-sad-science-clown]

Great Basin National Park: a Historical Rundown

The Great Basin lays just South of the 6 and 50 highway in the US, close to the border of Utah and covers much of Northern and Central Nevada, small parts of Wyoming, Idaho, Organ and California. The area is hardly populated with Baker, NV being the closest town.

In the 1800′s George Montague Wheeler led expeditions in the area as a topographer for the U.S. Army Corps of Engineers, along side him was GK Gilbert; who was the first to write a geological report of the area. 

Later on in the 1800′s Absalom Lehman came to the basin in search for gold and other valuable minerals. However, he was unsuccessful and lived life as a rancher selling supplies and food to the miners that came through. By 1855 he made the marvelous discovery of caves above his ranch and began to give tours. 

The caves and their tours became a staple of the area and was pronounced the Lehman Caves National Monument in 1922. About 64 years later the Great Basin was named a National Park in 1986.

Let it be told that the history of the Great Basin does exceed that of its story of becoming a national park, or any other instances of human history within it. It is within the rocks that the Great Basin tells its tales.

The Great Basin starts its story in a Neoproterozoic, Cambrian ocean that existed all the way until the Pennsylvania. Through out this time, the ocean levels rose and fell, which is told by the transgression and regression sequences in the ancient sedimentary rocks. It wasn’t until the upper Paleozoic that the tectonic activity shifted the continental shelf environment.

Unconformity lies within the early Mesozoic Era and has not yet been added to the narrative but the story continues on into the Late Mesozoic Era in which faulting and igneous intruding was present due to the Sevier and Laramide Orogenies. The activity of crustal thickening and shortening along with plutonic intrusion was carried out throughout the Early Tertiary Period in the Paleogene Epoch. Low grade metamorphism during the Mesozoic burial beneath thrust sheets occured in the Pole Creek Limestone, Prospect Mountain along with other older rocks from the Neoproterozoic and lower Paleozoic. 

Throughout the Cenozoic Era there was much andesitic volcansim. The Snake Range accumulated ash flows, tuffs and conglomerates. Most of the Volcanoes are about as old as the Oligocene of the late Paleogene. From the Oligocene Epoch to the Miocene Epoch of the early Neogene, there is a major extension of Snake Range. The displacement of the Snake Range detachment fractured the upper plate rocks on the South side and exposed the lower plate to the Metamorphic Core Complex

From the Miocene, the entire region was uplifted and broken up by a series of normal faults the created the tilted Basin and Range, along with block faulting. Any further volcanism was of basaltic composition.

As far as the Quaternary climatic changes go, there was multiple instances of Alpine Glaciation, that occurred in the area. Their glacial decomposition left the Lehman Creek moraine at 8100ft and the Dead Lake moraine at 9500ft. The Pleistocene glaciation formed the Lehman Caves. They also eroded the summits of Snake Range. Constant down slope erosion continues to create immense weathering, along with snow that collects in the summit’s hollows. There is still a glacier left to be found in the cirque of Wheeler Peak, along with a rock glacier.

[debayangatley]

Dept. of Applied geology at Indian Institute of Technology (Indian School of Mines), Dhanbad.

Established in 1927

This istitute probably hosts two of the oldest departments Geology and Mining Engineering in Asia.

[bijoux-et-mineraux]

Opal var. Menilite (”Liver Opal”) - Paris, Ile-de-France, France   

 Menilite is a greyish-brown form of opal. It is also known as “liver opal” or "Leberopal" (German), due to its color. It is called menilite because it was first described from Ménilmontant (Paris), France, where it occurs as concretions within bituminous early oligocene menilite shales. The specimen features strange stalactitic and "flown" forms, like wax, which run out from a candle.

[quiet-nymph]

CALCITE

Katanga, Democratic Republic of Congo, sold by Weinrich Minerals

[polypyrite]

Whenever I see the word dyke, it always takes time for my Brain to contextualise it within the sentence.

As I learnt the word as a geolgoy term, before I knew of its meaning of a lesbian person.

So, I always default to an igneous intrusion going against country rock. Instead of wlw. Which I find is funny. And on the topic, orthoclase feldspar, taught as having a fleshy colour (pinkish), is now being taught to me by my 67something teacher as Anglo-Saxon fleshy. And I'm not sure if that's better lol

Either way. I love geology, and it rocks.

[thatgeographychick]

More pics of the unidentifiable fossil

[rabbitcruiser]

Clouds (No. 959)

Arches National Park, UT

[just-a-sad-science-clown]

Types of  Earthquake Waves Cross Word puzzle

[geologicalgeorgian-blog]

Some nice ripple marks in sandstone at Cloudland Canyon! I think that the flow was NE to SW, but I'm not sure!

[mountainsinmoonlight-blog]

If any geologists out there want to have a great laugh, go here:

http://whatisgeology.tumblr.com/

[rabbitcruiser]

Clouds (No. 932)

Colorado National Monument, CO 

[asifoundit-blog]

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[earthstory]

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mysticalnightmare

When you have someone good to accompany you, difficult road becomes easier to deal with

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But enjoying your own company is an art

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