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Thread: Finding old dry riverbeds

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  1. #1
    A#1
    A#1 is offline
    us
    El Supremo!!

    Feb 2018
    Traverse City, Michigan
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    Other Peoples Trash

    Finding old dry riverbeds

    I've been scanning over USGS 7.5 minute topo maps, looking for old, now dry riverbeds. I ain't really found much.

    Anyone got any pointers on locating them? How would you do it?

  2. #2
    us
    Feb 2015
    Moses Lake WA & Provo UT
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    Prospecting
    I think Lidar would be helpful. The images are like topo maps, but have better definition when it comes to small changes in elevation under tree cover. There's a thread about it right now on this same forum. It can defenitely be helpful to see old benches up above the river that have vegetation on them now.
    et1955 and ExcuseToHike like this.

  3. #3
    us
    May 2014
    AZ
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    Just come out to Arizona, they are everywhere...... Boots on the ground looking for out of place river rocks. Ma Nature has covered them up or relocated them so most likely no geological techniques to predict them other than by observation(?).

    Good luck.
    Last edited by arizau; Jan 23, 2019 at 01:26 PM.
    Clay Diggins and rodoconnor like this.
    If it can't be grown, it must be mined!

  4. #4
    us
    Mar 2012
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    All Types Of Treasure Hunting
    Just drive . Look at road cuts . Ancient riverbeds are everywhere. If you are in gold country and can locate an ancient riverbed underneath a lava flow-CHA CHING\
    N-Lionberger likes this.

  5. #5
    us
    Brian

    Mar 2014
    Central Oregon Coast
    Whites GMT Garret fully underwater
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    It all depends on where you are looking (state by state) and understanding some of the Geology of the area you are interested in . Az is all together different from Mich. There are all kinds of ancient riverbeds,


    Bejay
    delnorter, Clay Diggins and et1955 like this.

  6. #6
    Charter Member
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    Ed Tracy

    Jan 2015
    Shoreline,wa
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    Quote Originally Posted by OwenT View Post
    I think Lidar would be helpful. The images are like topo maps, but have better definition when it comes to small changes in elevation under tree cover. There's a thread about it right now on this same forum. It can defenitely be helpful to see old benches up above the river that have vegetation on them now.
    So true Owen, do recognize this area ?Click image for larger version. 

Name:	lidar1.jpg 
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ID:	1673768
    Gold4Mike and travis.gore.79 like this.

  7. #7
    us
    Feb 2015
    Moses Lake WA & Provo UT
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    442 times
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    Quote Originally Posted by et1955 View Post
    So true Owen, do recognize this area ?Click image for larger version. 

Name:	lidar1.jpg 
Views:	79 
Size:	402.1 KB 
ID:	1673768
    You know that's the first place I looked when that link got posted

  8. #8
    Charter Member
    us
    Ed Tracy

    Jan 2015
    Shoreline,wa
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    Quote Originally Posted by OwenT View Post
    You know that's the first place I looked when that link got posted
    I wonder why. LOL

  9. #9
    us
    Dec 2018
    Central Washington
    Minelab Go-Find 22
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    All Types Of Treasure Hunting
    This is an example of a large ancient river bed that can be seen via Lidar.

    Click image for larger version. 

Name:	Dry River Beds on Lidar.PNG 
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ID:	1674524


    Here is the same area but on a regular map.

    Click image for larger version. 

Name:	Dry River Beds on Map.PNG 
Views:	44 
Size:	1.89 MB 
ID:	1674525

  10. #10
    us
    Feb 2015
    Moses Lake WA & Provo UT
    345
    442 times
    Prospecting
    Excusetohike, where in WA do you live?

  11. #11
    us
    Dec 2018
    Central Washington
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    Snoqualmie area.
    OwenT likes this.

  12. #12
    us
    Dec 2018
    Central Washington
    Minelab Go-Find 22
    5
    12 times
    All Types Of Treasure Hunting
    Quote Originally Posted by A#1 View Post
    I've been scanning over USGS 7.5 minute topo maps, looking for old, now dry riverbeds. I ain't really found much.

    Anyone got any pointers on locating them? How would you do it?

    I hunted around for a while for Michigan area Lidar maps but did not find any that I really liked. You might have better luck but even without them if you know what to look for you can see the ancient river beds on topographical map. You might have the best luck if you look on the inside bends just like you would in a regular river. I am admittedly still a n00b at prospecting but others here might be able to confirm or refute this.

  13. #13
    Charter Member
    us
    Ed Tracy

    Jan 2015
    Shoreline,wa
    Equinox 800
    437
    733 times
    Prospecting
    Quote Originally Posted by ExcuseToHike View Post
    I hunted around for a while for Michigan area Lidar maps but did not find any that I really liked. You might have better luck but even without them if you know what to look for you can see the ancient river beds on topographical map. You might have the best luck if you look on the inside bends just like you would in a regular river. I am admittedly still a n00b at prospecting but others here might be able to confirm or refute this.
    Lidar maps are another great tool for us to use, pic 1 and 2 are of the same area, google earth and lidarClick image for larger version. 

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ID:	1674533Click image for larger version. 

Name:	lidar1.jpg 
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ID:	1674534 Topo maps lack definition and detail.
    russau and OwenT like this.

  14. #14

    May 2005
    St. Louis, missouri
    5,756
    4336 times
    If I'm not mistaken that area was on public t.v. awhile back and it was created from a ancient Ice dam that was 2 miles (?) tall and backed up a massive lake ....it eventually broke open and gorged out that valley that went to the west. While that was going on the massive flow of water /ice created "pot holes" in the rock floor of that valley!

  15. #15

    May 2005
    St. Louis, missouri
    5,756
    4336 times
    In the Keene catalog, a listing of gold books and such there is a book titled "Lost River of gold" .GREAT READ!! but it also talked of a MASSIVE River that flowed north from the Mammoth MTn. area that flowed from Southern cal. to Alaska and it also branched off east to the Mississippi River.I did a little research and viewed maps and it appeared to me that it flowed through Kansas. Would'nt that be a find of a life time!!
    et1955 likes this.

 

 

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