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Author | Topic: Large round boulders on hilltops | |||||||||||||||||||||||||||
DBlevins Member (Idle past 3776 days) Posts: 652 From: Puyallup, WA. Joined: |
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.
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roxrkool Member (Idle past 989 days) Posts: 1497 From: Nevada Joined: |
jacen writes: 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. 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. 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 3928 days) Posts: 4258 Joined: |
yeah but could you have been more condescending about it? jesus.
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Christian Member (Idle past 6256 days) Posts: 157 Joined: |
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 6256 days) Posts: 157 Joined: |
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 989 days) Posts: 1497 From: Nevada Joined: |
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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Christian Member (Idle past 6256 days) Posts: 157 Joined: |
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.htmlRemember that Katrina was an increadibly small flood compared to what I am proposing.
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Christian Member (Idle past 6256 days) Posts: 157 Joined: |
Yes, quite a bit like that. Where was that taken?
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Christian Member (Idle past 6256 days) Posts: 157 Joined: |
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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Christian Member (Idle past 6256 days) Posts: 157 Joined: |
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.
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AdminAsgara Administrator (Idle past 2303 days) Posts: 2073 From: The Universe Joined: |
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.
AdminAsgara Queen of the Universe Comments on moderation procedures (or wish to respond to admin messages)? - Go to:
http://asgarasworld.bravepages.com http://perditionsgate.bravepages.com
New Members: to get an understanding of what makes great posts, check out:
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roxrkool Member (Idle past 989 days) Posts: 1497 From: Nevada Joined: |
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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coffee_addict Member (Idle past 477 days) Posts: 3645 From: Indianapolis, IN Joined: |
Christian writes:
Haha, you're too late. I just changed it. If you click on it, it will blow up for you to see better.
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.
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coffee_addict Member (Idle past 477 days) Posts: 3645 From: Indianapolis, IN Joined: |
Christian writes:
And you just proved my point exactly.
take a look at this:http://www.wwltv.com/.../slideshow/083005_dmnkatrina/15.htmlRemember that Katrina was an increadibly small flood compared to what I am proposing. 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
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tsig Member (Idle past 2909 days) Posts: 738 From: USA Joined: |
Remember that Katrina was an increadibly small flood compared to what I am proposing. What characteristics of water change with a change in scale?
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