Fluvial Depositional Environments & Stratigraphy | GEO GIRL

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  • เผยแพร่เมื่อ 23 ธ.ค. 2024

ความคิดเห็น • 46

  • @pizzatide8328
    @pizzatide8328 3 ปีที่แล้ว +8

    Legend! Saved me a lot of time with this one, speeding through the basics of braided and meandering systems. Thanks!

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว

      Yay! So glad to hear the video helped you out ;)

  • @umairpioneer
    @umairpioneer 3 ปีที่แล้ว +8

    The presentation was delivered so well. It clarified certain ambiguities in my understanding of fluvial systems. I would suggest to make a video on evolution of river systems. Cheers!

  • @Get_to_the_Point
    @Get_to_the_Point 2 ปีที่แล้ว +2

    Great vid. Don't forget helical flow, which is flow perpendicular to the general direction of flow in meandering channels. Helical flow is a large driver in sediment transport, as it is effective at churning up those sediments.

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      Oh interesting! Thanks for sharing, I didn't know that. So helical flow would be classified as turbulent, right? Or would it be in a whole different category?

    • @Get_to_the_Point
      @Get_to_the_Point 2 ปีที่แล้ว +1

      ​@@GEOGIRL Yes helical flow occurs during turbulent flow. If you watch a meander bend during flooding, you will actually see helical flow in addition to backwater flow. During flooding, backwater flow often occurs on the point bar...you will see water flowing upstream. This is one of the reasons that velocity decreases as floodwaters rise...it creates more turbulence. I think you mentioned velocity decreasing in larger flood events in the vid but I'm not sure.

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว

      @@Get_to_the_Point Oh interesting! I am going to have to go watch some flood videos now! haha
      Thanks for sharing your knowledge, I hope many people stubble upon this comment so they can learn what I didn't know to teach them ;)

    • @Get_to_the_Point
      @Get_to_the_Point 2 ปีที่แล้ว +1

      @@GEOGIRL The true measure of intelligence is the ability to explain complex things to simple people, and they understand it. This puts you above Einstein in the IQ Dept ! Rock on !

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      @@Get_to_the_Point oh my gosh! You are too sweet, thank you so much! ;D

  • @mazenomar7279
    @mazenomar7279 2 ปีที่แล้ว +1

    How to recognize point bar deposits from outcrop or core data and how trough cross bedding formed in fluvial system, .thanks

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      For a point bar sequence, I would look for a fining upward sequence with cross strat lower in the section, then ripples further up, and then interbedded mud at the top representing the floodplain. Cross bedding is just the bedding that results from migration of ripples/dunes. Trough cross bedding forms in these settings due to the increase in velocity at the inner bank of the curve, this is where the bank interferes with the flow enough to deposit ripples that migrate in a way that cuts across one another (trough cross bedding). At least that's my understanding, I hope that helps a little bit. I think you may find this video: th-cam.com/video/fmQXGT2oUno/w-d-xo.html helpful (it's my sedimentary structures video where I talk more about these structures & depositional environments). :)

    • @mazenomar7279
      @mazenomar7279 2 ปีที่แล้ว +1

      @@GEOGIRL many thanks for your quick responce.

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      @@mazenomar7279 Of course ;)

  • @multi.tasking
    @multi.tasking 2 ปีที่แล้ว +1

    How can we recognize the old from the recent deposit?
    Does the fluvial system respect the stratigraphy principle?

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +2

      Well if you mean recent as in modern, then there would still be a river there... Whereas, an ancient stratigraphic section indicative of an ancient fluvial system would not have a river there and would contain consolidated, compacted, & lithified sediment rather than unconsolidated sediment.
      If you mean recent as in ancient, but relatively young compared to another outcrop, then you would have to find a way to date the strata in each outcrop to compare them. Unfortunately, sedimentary materials are not easily dated unless they contain fossils indicative of a certain time period (index fossils) or strata that is volcanic in origin (e.g., volcanic ash) which can be dated using isotopes. So it depends... But the good news is, in ancient strata, there are typically layers either above or below the un-date-able layers that will give ages with which you can constrain the age of your middle strata if that makes sense.
      Regarding your second question, I am not aware of a single principle of stratigraphy, but I do know of the principles like Steno's laws (superposition, original horizontality, lateral continuity, etc.). If you are referring to those principles, then yes, fluvial systems obey those.
      Hope that helps ;)

  • @henryglass8819
    @henryglass8819 ปีที่แล้ว

    Thank you, you are a really good teacher. Great work really appreciate it.

  • @danielaquiroz9731
    @danielaquiroz9731 3 ปีที่แล้ว +2

    Great and very clear presentation. Thank you!♥

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว

      Thanks for the comment, I am so glad you found it helpful!

  • @urrywest
    @urrywest ปีที่แล้ว

    I really want to know about the chemestry of pottery and concrete...

  • @azalaeya2291
    @azalaeya2291 4 หลายเดือนก่อน

    hii, wanna ask, is it facies association same as depositional environments?

  • @JoesFirewoodVideos
    @JoesFirewoodVideos 3 ปีที่แล้ว +2

    Wednesday night boredom alleviated!
    I ❤️GEO GIRL

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว +1

      Haha, having to watch old videos because I am not posting on Wednesdays? I love it! 😂👌

  • @omeryalcnsar2391
    @omeryalcnsar2391 2 ปีที่แล้ว +2

    Pleistosendeki 4 buzul dönemi bilhassa Würm buzulu sonrası gelişmeler ilgi alanımızda...Holosendeki transgresyonun çok yönlü tetkiki devam ediyor...
    Saygılar sevgiler....

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      Thanks for the suggestion! If you haven't already, I suggest you check out my Pleistocene - Holocene video: th-cam.com/video/rcWu1MtvyPg/w-d-xo.html
      But if you watch that one and still want me to go more into detail on the glaciations during that time, I would be happy to, just let me know ;)

    • @omeryalcnsar2391
      @omeryalcnsar2391 2 ปีที่แล้ว +1

      @@GEOGIRL
      Çok teşekkürler ediyorum...yarından itibaren PANGEA da Senin paylaşımlarını yayınlayacağız ...alâkan için çok teşekkürler...
      Saygılar sevgiler....

  • @dangerouspoems4707
    @dangerouspoems4707 2 ปีที่แล้ว +2

    Thank you for information

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      Of course, I hope you found it helpful :)

  • @shubhampathak6190
    @shubhampathak6190 ปีที่แล้ว +1

    Awesome Content !! LOVE FROM INDIA

    • @GEOGIRL
      @GEOGIRL  ปีที่แล้ว

      Thank you! ;D

  • @stavroullavassiliou7645
    @stavroullavassiliou7645 3 ปีที่แล้ว +1

    You're amazing! 🙏🏻

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว +1

      Thanks so much, I am glad you enjoyed the video! ;D

  • @madridi1233
    @madridi1233 2 ปีที่แล้ว +1

    This is amazing!! Thank you

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      Of course! I am so glad you found it helpful ;D

  • @muhammadpanezai9720
    @muhammadpanezai9720 2 ปีที่แล้ว +1

    I m student of igneous Petrology but your lectures are simply outstanding. The only problem is you speak too fast. When i slow down the speed then your voice sort of tear down further causing irritation. Plz speak little bit slow ☺️☺️

  • @bharatsinghlodhi206
    @bharatsinghlodhi206 3 ปีที่แล้ว +1

    Wow amazing 😎

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว

      Thanks! Glad you thought so ;D

  • @intan6409
    @intan6409 3 ปีที่แล้ว +1

    amazing video thank u!!!

    • @GEOGIRL
      @GEOGIRL  3 ปีที่แล้ว

      Thanks so much, I am so glad you found it helpful! :D

  • @asedbrish-iw6zf
    @asedbrish-iw6zf ปีที่แล้ว

    Thank you

  • @mgrogan2775
    @mgrogan2775 4 ปีที่แล้ว

    Great video thank you!

  • @joesample3796
    @joesample3796 หลายเดือนก่อน +1

    You Rock! TY!!

  • @sppu6609
    @sppu6609 2 ปีที่แล้ว +1

    Geo Girl you beauty ..

  • @aminecherif289
    @aminecherif289 ปีที่แล้ว

    Good presentation, I am currently following your videos, hope collobartion with you, best wishes from Ouargla university, Algeria

  • @mohamedashrafelsherif6458
    @mohamedashrafelsherif6458 2 ปีที่แล้ว +1

    please please please speak slowly

    • @GEOGIRL
      @GEOGIRL  2 ปีที่แล้ว +1

      Thanks for the suggestion, I know I was really bad about this for a while, I hope i've gotten a bit better in my more recent videos haha

    • @mohamedashrafelsherif6458
      @mohamedashrafelsherif6458 2 ปีที่แล้ว +1

      Your videos are amazing