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Eolian (Desert) Depositional Environments & Stratigraphy | GEO GIRL
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- Опубликовано: 7 авг 2024
- This video covers Eolian (aeolian or desert) processes, deposition, sedimentary structures, and stratigraphy. We start with classification of eolian environments, which include deserts and semi-arid regions, beaches and sabkas, sandy river banks, and periglacial regions. This lecture is focused on deserts dominated by sand dunes and ripples. I go over the global distribution of deserts and the coriolis effect, then we jump into the types of grain transport in eolian systems. Grains can be transported by wind the same way they are transported by water, by suspension in the air, bouncing along the ground or saltation, or rolling along the ground which is called creep. Because of this differential transport of sediment grains depending on grain size, this sorts the grains, so that the grain sizes are very uniform after having been heavily eroded and transported a long way. Wind heavily erodes sediment by deflation and abrasion. Bedforms in deserts include sand sheets, ripple marks, dunes, and draas, which can be preserved in the rock record as sedimentary structures. Then I go over the types of dunes, the differences between dunes and ripples, the differences between dunes and draas, what sand sheets are, what loess is (eolian silt), how dust is transported accross the world, and why mountain belts lead to rain shadow desert regions. We also cover how dunes form and the morphology of dunes, including the stoss side, the lee side. I also go over the common facies adjacent to desert facies, such as playa lakes, alluvial fans, & fluvial systems. Lastly, we go through the preservation of desert sediments in the rock record, the stratigraphy distinctive of eolian facies, and other hints we can use in the rocks to recognize what type of eolian environment formed the rocks we are looking at (i.e., eolian vs fluvial-eolian vs beach eolian).
References:
Depositional Sedimentary Environments: amzn.to/3kutTso
Facies models 4: amzn.to/3Fp5v3B
www.geol.umd.edu/~jmerck/geol...
GEO GIRL Website: www.geogirlscience.com/ (visit my website to see all my courses, shop merch, learn more about me, and donate to support the channel if you'd like!)
0:00 Types of eolian environments?
1:27 Sediment transport in eolian systems
2:29 Wind erosion in deserts
3:07 Desert bedforms
3:47 Ripple & dune formation
4:31 Types of dunes (morphologies)
5:26 Dras
5:43 Sand sheets and dust /loess
6:40 Global dust transport?!
7:09 Eolian facies distribution
8:22 Eolian deposit preservation
9:33 Eolian dune stratigraphy
10:54 Eolian vs. fluvial eolian stratigraphy
12:00 Eolian vs. beach stratigraphy
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Non-textbook books I recommend:
Oxygen by D. Canfield: amzn.to/3gffbCL
Brief history of Earth by A. Knoll: amzn.to/3w3hC1I
Life on young planet by A. Knoll: amzn.to/2RBMpny
Some assembly required by N. Shubin: amzn.to/3w1Ezm2
Your inner fish by N. Shubin: amzn.to/3cpw3Wb
Oxygen by N. Lane: amzn.to/3z4FgwZ
Alien Oceans by K. Hand: amzn.to/3clMx1l
Life's Engines: amzn.to/3w1Nhke
Tools I use as a geologist/teacher/student:
Geology field notebook: amzn.to/3lb6dJf
Geology rock hammer: amzn.to/3DZw8MA
Geological compass: amzn.to/3hfbdLu
Geological hand lens: amzn.to/3jXysM5
Camera: amzn.to/3l6fGRT
Image sources:
geology.isu.edu/Alamo/devonian...
doi.org/10.1144/EGSP25.03
officersiasacademy.blogspot.co...
myweb.facstaff.wwu.edu/talbot/...
smallpond.ca/jim/sand/migrati...
www.geol.umd.edu/~jmerck/geol...
www.researchgate.net/figure/D...
tamsilttrekking.com/dunes-oasi...
www.amazon.ca/Facies-Models-R...
giphy.com/gifs/headlikeanoran...
giphy.com/gifs/stunninglink-y...
omega7geo.wordpress.com/2013/...
www.geocaching.com/geocache/G...
www.slideshare.net/wwlittle/e...
www.geol.umd.edu/~jmerck/geol...
www.paperhi.com/Toplist_Best_2...
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Better than many videos. Explaining with the pictures helped me a lot.
Thank you so much for your videos. They are very helpful.
Great video, felt like a blitz review of my aeolian geomorphology class!
Thank you so much for the help Geo Girl. Maybe a small detail but I really appreciate microediting taking out the natural pauses in your speech pattern. Really condenses the lesson and trims the fat so to speak; I found it very helpful. You've gained a new subscriber.
If you're not in the actual teaching profession, I'd recommend it because you're a natural fit.
I am so glad you found the video helpful and you like the pace and length! Thanks so much for the feedback :) And that is so touching that you think I would make a good teacher because becoming a professor is my goal! :D
This is awesome. Thank you!
Thank you so much maam for conglomeration lectures of all the depositional environments, it really helps me to get a complete knowledge about depositional environments. I wish i could have seen these during release date 😢. Thank you again, appreciated 😊✌️.
Thank for helping out with an interest!
Of course! Glad you found it helpful :)
binge watching before the test!!
Yay! That is the goal behind all the playlists on my channel, good luck with your exam!
Harikasın Rachel...
Saygılar sevgiler....
These videos are really informative and you have done a really good job in condensing all the relevant points. Will it be possible to make such a video on karst topography and environment as well? Cheers!!
Yep! Got karst and cave geology on the list ;D
@@GEOGIRL Thanks a lot.Much appreciated :)
You are an amazing teacher!
Thanks so much! This comment made my day ;)
Many sources claims Playa lake as erosional feature. Plz clear my doubt whether it is erosional or depositional or a result of both
Both! To my understanding, playa lakes are dried up lakes that form due to over-evaporation, which causes evaporite deposition (minerals that preciptiate from over-saturated water, such as calcite, gypsum, & other salts), which then can be eroded by wind and transported to nearby dune fields, which leaves the playa lake as a dual depositional/erosional feature. Hope that makes sense ;)
@@GEOGIRL Thank you 🙂
I've always wanted to create a geology channel since my mineralogy days :(
Go for it! You can still do it! :)
This video just really reminds me of White Sands, a National Monument that I love to visit quite often. I’m pretty fascinated by it’s geology and of course I’m especially obsessed with it’s prehistory, specifically with the fossilized tracks that were left behind in the gypsum by ancient humans and the Ice Age Megafauna. 🦣🐾 Isn’t that interesting?
Oh wow! I have visited White Sands many times, but never seen the fossilized tracks! That sounds so cool, I will have to go check that out :D
@@GEOGIRL It is really cool my friend. In the visitor center, there’s a new little exhibit featuring the casts of a fossilized tracks that were left behind by a Harlan’s ground sloth, compared to human tracks. 🦥
So I guess this all explains why the gift shop always sold Ice Age merchandise. 🦣
Fun Fact: Smilo came from that gift shop along with a few other Ice Age plush animals.
@@GEOGIRL Hey Rachel, Merry Christmas!!! 🎄🎁 As always, I just want to remind you that you’re such a remarkably brilliant person who I pleasurably enjoy learning with all the time and your incredible channel that I really love still has my full support. There is no greater gift than friendship and I cherish ours very dearly along with all of the happiness that you bring me. ❤🤗 I hope you have a safe and happy holiday my amazing friend, you’re the best. 😉👍
@@Smilo-the-Sabertooth I wasn't even going to get online today, but then saw on my email that one of the comments was you and had to come respond! Thank you so so much for your sweet words and ongoing support and encouragement! You are SO amazing and you really are single handedly responsible for the majority of my drive to continue posting haha ;)
@@GEOGIRL You’re very welcome Rachel. I can’t tell you how much it means to me that you would take the time just to respond to my comment even when you have other things to do, you truly are such an amazing friend who makes me very happy, thank you so much. You always excite me when you leave me such amazing replies that fill my heart with joy. 🤗❤
It’s very pleasing for me to know that I keep you motivated to continue posting more fantastic videos on your incredible channel, and I shall continue to do so, keep it up with the terrific work and don’t ever stop. My support and encouragement is still all yours because you more than deserve it and you’re still my favorite teacher. Still so much more to come. 😉👍
And I hope you had a wonderful Christmas as well my amazing friend. Our friendship is the greatest gift ever, isn’t it? 🎄💝🎁 And Happy New Year!!!!! 🥳🎉🎊 I really look forward to another year of learning with you in more of your educational videos on your amazing channel, always makes my days that much better.