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Author Topic:   Large round boulders on hilltops
DBlevins
Member (Idle past 3775 days)
Posts: 652
From: Puyallup, WA.
Joined: 02-04-2003


Message 31 of 57 (252550)
10-17-2005 10:53 PM
Reply to: Message 14 by Christian
10-17-2005 11:45 AM


Chemical weathering
The water that smoothed the cracks of those boulders was from rainwater, that percolates through the rocks eroding and rounding them. Over a long period of time those rocks become rounder and smoother.

This message is a reply to:
 Message 14 by Christian, posted 10-17-2005 11:45 AM Christian has replied

Replies to this message:
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roxrkool
Member (Idle past 988 days)
Posts: 1497
From: Nevada
Joined: 03-23-2003


Message 32 of 57 (252559)
10-18-2005 12:28 AM
Reply to: Message 30 by coffee_addict
10-17-2005 10:23 PM


jacen writes:
Both, actually. I fully realized that boulders do get moved around quite a bit by forces of nature. What I'm having trouble believing is a flood would actually move truck and building size boulders into nice and neat formations, sometimes one on top of another.
Well, you're right of course, but then we still don't know what size boulders we're considering here since Christian hasn't offered up that information yet.
I did state, though, that most likely any boulders as large as you're suggesting are the result of in situ weathering of bedrock. As Dblevins noted, weathering and spalling off along joints will cause some rock types to become roundish boulders. That's what is happening in coragyps' link. (I see in you agreed with this already.)
A flood the size of Noah's might actually have enough force to move enormous boulders around (not sure building-sized boulders, though, probably depends on how big you're talking). However, material deposited by a mega-flood is going to display certain diagnostic characteristics, such as cross-beds, laminae, graded bedding, channeling, etc., likely forming at massive scales. Additionally, the material itself will be heterolithic, meaning the deposit will be comprised of a large variety of rock types derived from a huge source area. Boulders derived in situ are likely to be composed of one rock type; or at least a few very similar/related rock types.
We're not talking about glaciers or hundred years floods. We're talkign about a flood that supposedly took place 40 days and 40 nights.
As I stated above, depending on the actual size of boulders, a mega-flood may be able to move and deposit enormous boulders. I was simply pointing out that it's not impossible to get sedimentologically deposited boulders on tops of mountains as opposed to ones created in situ.
Good luck.
We might get lucky.
This message has been edited by roxrkool, 10-18-2005 12:30 AM

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macaroniandcheese 
Suspended Member (Idle past 3927 days)
Posts: 4258
Joined: 05-24-2004


Message 33 of 57 (252560)
10-18-2005 12:28 AM
Reply to: Message 28 by coffee_addict
10-17-2005 10:11 PM


yeah but could you have been more condescending about it? jesus.

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Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 34 of 57 (252569)
10-18-2005 1:14 AM
Reply to: Message 31 by DBlevins
10-17-2005 10:53 PM


Re: Chemical weathering
somehow that's hard to imagine. I don't think I'm qualified for this discussion but it seems that rainwater would cause one-sided erosion, not round boulders.

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Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 35 of 57 (252570)
10-18-2005 1:23 AM
Reply to: Message 16 by jar
10-17-2005 11:55 AM


Lots of ways. Mostly through normal erosion events. Big rock break down into little rocks and little rocks to smaller rocks and those into sand.
I can see parts of the bigger rocks breaking off in normal processes, but I'm having a hard time imagining how they could become smooth and round without being tumbled, somehow.
The other half happens less regularly. It's the uplift portion. I was out there during the 1971 Earthquake and while it was abrupt, it was also awe inspiring.
Did you wittness something geological during that earthquake?

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roxrkool
Member (Idle past 988 days)
Posts: 1497
From: Nevada
Joined: 03-23-2003


Message 36 of 57 (252571)
10-18-2005 1:25 AM
Reply to: Message 34 by Christian
10-18-2005 1:14 AM


Re: Chemical weathering
Actually, he's correct. It's a result of chemical weathering along joints.
See: images of spheroidal weathering and websites about spheroidal weathering
This message has been edited by roxrkool, 10-18-2005 01:26 AM

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 Message 34 by Christian, posted 10-18-2005 1:14 AM Christian has not replied

  
Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 37 of 57 (252578)
10-18-2005 1:42 AM
Reply to: Message 21 by coffee_addict
10-17-2005 5:06 PM


You didn't answer my question. Have you tried to make a rock float in water?
Well, I've thrown rocks into the water before, but never tried to make them float because I'm pretty sure that they don't.
Look at my avatar...
It looks like a white piece of paper with some sort of writing on it that I can't read because it's too small and apparently in another language.
Do you agree with what I said so far?
take a look at this:http://www.wwltv.com/.../slideshow/083005_dmnkatrina/15.html
Remember that Katrina was an increadibly small flood compared to what I am proposing.

This message is a reply to:
 Message 21 by coffee_addict, posted 10-17-2005 5:06 PM coffee_addict has replied

Replies to this message:
 Message 43 by coffee_addict, posted 10-18-2005 3:30 AM Christian has not replied
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Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 38 of 57 (252579)
10-18-2005 1:44 AM
Reply to: Message 22 by Coragyps
10-17-2005 5:30 PM


Yes, quite a bit like that. Where was that taken?

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 Message 22 by Coragyps, posted 10-17-2005 5:30 PM Coragyps has replied

Replies to this message:
 Message 46 by Coragyps, posted 10-18-2005 9:40 PM Christian has not replied

  
Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 39 of 57 (252581)
10-18-2005 1:51 AM
Reply to: Message 26 by coffee_addict
10-17-2005 9:16 PM


Most of the boulders range in size from house size to desk size, approximately. The piles aren't that huge. My three-year-old was able to climb one in about an hour. Some of the hills seem more like piles of large rocks while others seem more like piles of dirt with big rocks all over them.

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Replies to this message:
 Message 42 by roxrkool, posted 10-18-2005 2:18 AM Christian has not replied

  
Christian
Member (Idle past 6255 days)
Posts: 157
Joined: 10-16-2005


Message 40 of 57 (252582)
10-18-2005 1:54 AM
Reply to: Message 28 by coffee_addict
10-17-2005 10:11 PM


How is it that Jacen can edit Lam's post?
Also, I don't think the hills in my area are the only evidence for the flood.

This message is a reply to:
 Message 28 by coffee_addict, posted 10-17-2005 10:11 PM coffee_addict has not replied

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AdminAsgara
Administrator (Idle past 2302 days)
Posts: 2073
From: The Universe
Joined: 10-11-2003


Message 41 of 57 (252583)
10-18-2005 1:57 AM
Reply to: Message 40 by Christian
10-18-2005 1:54 AM


If you look at jacen or lam's profile, you will see that they are aliases of each other. You can give yourself another name by editing your own profile and defining a new alias. These names will be linked together.

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    This message is a reply to:
     Message 40 by Christian, posted 10-18-2005 1:54 AM Christian has not replied

      
    roxrkool
    Member (Idle past 988 days)
    Posts: 1497
    From: Nevada
    Joined: 03-23-2003


    Message 42 of 57 (252586)
    10-18-2005 2:18 AM
    Reply to: Message 39 by Christian
    10-18-2005 1:51 AM


    Those boulders were most likely created in situ. There were not moved there by water or anything else - except maybe tectonism.

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     Message 39 by Christian, posted 10-18-2005 1:51 AM Christian has not replied

      
    coffee_addict
    Member (Idle past 477 days)
    Posts: 3645
    From: Indianapolis, IN
    Joined: 03-29-2004


    Message 43 of 57 (252599)
    10-18-2005 3:30 AM
    Reply to: Message 37 by Christian
    10-18-2005 1:42 AM


    Christian writes:
    It looks like a white piece of paper with some sort of writing on it that I can't read because it's too small and apparently in another language.
    Haha, you're too late. I just changed it. If you click on it, it will blow up for you to see better.

    This message is a reply to:
     Message 37 by Christian, posted 10-18-2005 1:42 AM Christian has not replied

      
    coffee_addict
    Member (Idle past 477 days)
    Posts: 3645
    From: Indianapolis, IN
    Joined: 03-29-2004


    Message 44 of 57 (252601)
    10-18-2005 3:34 AM
    Reply to: Message 37 by Christian
    10-18-2005 1:42 AM


    Christian writes:
    take a look at this:http://www.wwltv.com/.../slideshow/083005_dmnkatrina/15.html
    Remember that Katrina was an increadibly small flood compared to what I am proposing.
    And you just proved my point exactly.
    As you can see, the boats aren't all piled one on top of another in a single column. Rather, they are pretty much spread out in the little area that they are in.
    When things go through disasterous ordeals, they tend to go toward a state of "spread out" even if they are clumped together somewhere. You're not going to find 10 boats piled on each other in a single column like you do in some rock formations.
    Added by edit.
    And even then, these boats were designed to float, not sink as soon as they touch water. Therefore, if we're talking about the piling on top of each other, these boats actually had more chances to pile into the columns that we see in nature than rocks, and they don't. This shows you how very unlikely a disasterous flood in 40 days and 40 nights would create some of the boulder formations that we see, especially in the Rockies.
    This message has been edited by Lam, 10-21-2005 04:01 AM

    This message is a reply to:
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    tsig
    Member (Idle past 2908 days)
    Posts: 738
    From: USA
    Joined: 04-09-2004


    Message 45 of 57 (252870)
    10-18-2005 9:10 PM
    Reply to: Message 37 by Christian
    10-18-2005 1:42 AM


    Heavy Water?
    Remember that Katrina was an increadibly small flood compared to what I am proposing.
    What characteristics of water change with a change in scale?

    This message is a reply to:
     Message 37 by Christian, posted 10-18-2005 1:42 AM Christian has not replied

      
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