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Author Topic:   Continuation of Flood Discussion
Faith 
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Message 526 of 1304 (731784)
06-29-2014 3:20 PM


In Message 480 Percy says the monuments have been exposed to erosion for tens of millions of years and that the sandstone erodes at a rate of around 15 cm per thousand years, and siltstone at a rate of about 5 cm per thousand years.
That's about 5000 feet in ten million years for the sandstone. Pretty much takes care of that, shouldn't be any left standing without even multiplying the "tens" of millions. And 1660 feet in ten million years for the siltstone. Kinda does it there too wouldn't you say? So which part do you disagree with, the tens of millions of years since they started eroding or the rate or what?
ABE: Of course the truth of the matter is that layers were deposited in the Flood to a depth of some three miles or more, then when the water receded it eroded away a lot of the upper strata all over the Southwest leaving all those interesting formations. After the water was gone the formations were subject to yearly erosion. That's how it really happened.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.
Edited by Faith, : add URL

  
ringo
Member (Idle past 411 days)
Posts: 20940
From: frozen wasteland
Joined: 03-23-2005


Message 527 of 1304 (731785)
06-29-2014 3:46 PM


Faith writes:
That's about 5000 feet in ten million years for the sandstone. Pretty much takes care of that, shouldn't be any left standing without even multiplying the "tens" of millions.
If it erodes 5 feet in ten thousand years and it's five feet in radius, we'd expect it to be gone in ten thousand years. We can extrapolate backwards to estimate how long it's been eroding. I don't know why you think you can tell that there "shouldn't" be any left. You don't know when it started eroding.

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 Message 548 by edge, posted 06-30-2014 6:43 PM ringo has seen this message but not replied

  
Faith 
Suspended Member (Idle past 1444 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 528 of 1304 (731786)
06-29-2014 3:47 PM


Percy said it began eroding tens of millions of years ago. I already said that.

  
ringo
Member (Idle past 411 days)
Posts: 20940
From: frozen wasteland
Joined: 03-23-2005


Message 529 of 1304 (731787)
06-29-2014 3:51 PM


Faith writes:
Percy said it began eroding tens of millions of years ago.
And it will be gone in a few thousand years. How do you get that it "should" be gone already?

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 Message 538 by Faith, posted 06-30-2014 4:21 PM ringo has replied

  
Percy
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Message 530 of 1304 (731788)
06-29-2014 4:12 PM


Faith writes:
Scree once positioned on the pile has no reason to keep disintegrating like that, it's just going to get covered over by more scree.
Scree is exposed to weathering, which means things like wind, rain, temperature variations and freeze/thaw cycles. Even buried scree is vulnerable, though to a lesser degree, to weathering. Particles flake off the scree, water erodes and carry some away, grinding against other pieces of scree creates flakes, and over time each piece becoming smaller and smaller. The tiers upon which the scree rests are also subject to erosion, and buried scree eventually loses its supporting platform and falls to the next tier, eventually reaching the valley floor. The tiny particles that flake off the scree become the soil of the valley floor.
Anyway, the more likely scenario is that in all that time the butte should have been eroded down to nothing but a pile of scree in itself. IMHO of course.
Yes, of course. In time the West Mitten Butte will erode down to nothing.
The top of the butte represents former valley floor. The current valley floor was once a thousand feet higher than it is now. But when the region was uplifted it became an area of net erosion. Riverbeds crisscrossed the valley and gradually eroded it down, creating canyons that gradually widened and joined, leaving a valley of buttes behind. Almost all the material that once filled the current valley is now gone, only a few buttes remaining.
But of course we don't know the actual amount there do we? And if you look closely at the scree area it appears that it isn't all scree but that the scree has collected on top of a tier of layers that were already there which would of course take up quite a bit of the total volume of that talus or skirt. Unless those tiers were built to hold the scree? Hard to tell from the picture.
Yes, clearly the layers form tiers upon which the scree rests.
Seems to me we need to know just exactly how much scree there is in that pile.
If you wanted to know whether the current amount of scree represents the accumulations of a hundred thousand years or a million years or ten million years, then yes, we need to know precisely how much scree is present, precisely how fast it erodes off the sides of the butte, and precisely how fast it weathers away. But if you just want to know if that much scree could accumulate in a mere 4300 years then the answer is no, there's far too much scree to have accumulated in so brief a period of time. The entire valley floor is scree and the particles weathered from scree.
I don't recall estimating the speed of the water running off around the monuments.
That's true, you didn't provide an estimate, but I did provide a lower bound for you. Niagara Falls used to erode back about 5 feet per year before the diversion of water for electric power generation. The floor of Monument Valley used to be at least a thousand feet higher than it is today, and it is miles across. How do you imagine your flood eroded away an entire valley a thousand feet deep and at least 50,000 feet across in just a year when Niagara Falls can only manage 5 feet?
Somewhere back in those discussions about all that it was proved by some official link or other that drying does indeed form rock in some cases,...
Yes, someone did happen to mention that there actually are some types of rock that can form by drying, but they aren't the types of rock that make up most sedimentary layers, which are limestone, siltstone, sandstone and shale in this region and in most regions throughout the world. These types of layers form by deep burial, compaction, and cementation.
I've read ahead in this thread, and so I won't reply to your Message 488 because it looks like you figured out that the White Cliffs of Dover are eroding off their face, not off their top (at least not significantly). The English Channel widens every year.
--Percy

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Percy
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Posts: 22391
From: New Hampshire
Joined: 12-23-2000
Member Rating: 5.2


Message 531 of 1304 (731789)
06-29-2014 4:41 PM


Faith writes:
In Message 480 Percy says the monuments have been exposed to erosion for tens of millions of years and that the sandstone erodes at a rate of around 15 cm per thousand years, and siltstone at a rate of about 5 cm per thousand years.
Ringo already addressed this, but it doesn't hurt to say it another way. The region didn't begin eroding until it was uplifted some tens of millions of years ago. At the time the surface that would eventually become Monument Valley was a thousand feet higher, and what would eventually become the buttes were just buried sedimentary layers miles and miles in extent. Rivers crisscrossed the valley cutting it into canyons whose sides eroded away, eventually joining and continuing to erode and finally leaving behind only the buttes we see today.
That's about 5000 feet in ten million years for the sandstone.
That's not a bad estimate. Another way of looking at it is that these buttes were once as wide as all of Monument Valley. It did take millions and millions of years to erode them away to their current breadth of only thousands of feet. There must have been many more buttes millions of years ago, but they've eroded away to dust.
--Percy
Edited by Percy, : Improve phrasing.

  
Adminnemooseus
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Message 532 of 1304 (731790)
06-29-2014 5:48 PM


Terminal off-topic, summary mode now
Faith launched this thing off-topic at message 448, and I'm pretty sure there's been no contact with the topic theme since.
Summary mode - One last message per member, hopefully something about depositional models.
Adminnemooseus

Or something like that.

  
Faith 
Suspended Member (Idle past 1444 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 533 of 1304 (731791)
06-29-2014 6:37 PM


There is nothing to summarize. The thread was already off topic before I posted Message 448. If it was going to be interrupted for being off topic that should have been done pages ago because it picked up momentum and to stop it now is cruel. So many threads have been left to go severely off topic over the last many months why even bother at all?
Edited by Faith, : No reason given.

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 Message 537 by Pressie, posted 06-30-2014 7:31 AM Faith has replied

  
Admin
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Message 534 of 1304 (731792)
06-30-2014 7:14 AM


New Flood Thread Open for Discussion
Hi everyone,
Adminnemooseus dropped the Depositional Models of Sea Transgressions/Regressions - Walther's Law thread into summation mode, so I've created this copy of that thread so that the discussion may continue.

--Percy
EvC Forum Director

  
Admin
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Message 535 of 1304 (731794)
06-30-2014 7:14 AM


Thread Copied from Topic Proposals Archive Forum
Thread copied here from the Continuation of Flood Discussion thread in the Topic Proposals Archive forum.

  
Admin
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From: EvC Forum
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Message 536 of 1304 (731795)
06-30-2014 7:23 AM


Reply Information Lost
Hi everyone,
Unfortunately the "reply" information for this copy of the thread was lost in the copying process, but it should be present for new messages going forward.

  
Pressie
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Posts: 2103
From: Pretoria, SA
Joined: 06-18-2010


Message 537 of 1304 (731796)
06-30-2014 7:31 AM
Reply to: Message 533 by Faith
06-29-2014 6:37 PM


I disagree. The rocks beneath the Augrabies falls show conclusivly that the Earth is very, very old. Billions of years old.
I'd love Faith to tell all those geologists that they all are wrong, with evidence!
Edited by Pressie, : No reason given.

This message is a reply to:
 Message 533 by Faith, posted 06-29-2014 6:37 PM Faith has replied

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Faith 
Suspended Member (Idle past 1444 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 538 of 1304 (731816)
06-30-2014 4:21 PM
Reply to: Message 529 by ringo
06-29-2014 3:51 PM


Faith writes:
That's about 5000 feet in ten million years for the sandstone. Pretty much takes care of that, shouldn't be any left standing without even multiplying the "tens" of millions.
Ringo writes:
If it erodes 5 feet in ten thousand years and it's five feet in radius, we'd expect it to be gone in ten thousand years. We can extrapolate backwards to estimate how long it's been eroding. I don't know why you think you can tell that there "shouldn't" be any left. You don't know when it started eroding.
Faith writes:
Percy said it began eroding tens of millions of years ago.
Ringo writes:
And it will be gone in a few thousand years. How do you get that it "should" be gone already?
Ringo, first you said at the rate given it should be gone in ten thousand years, and that I don't know when it began eroding. I answered that Percy gave a figure for that of tens of millions of years ago so if it would be gone in ten thousand years from the time it started eroding that means it should have been long gone a long long time already. I don't get how there can be any problem understanding this. Double or triple the volume of the monument at that point if you want, it's still going to have been long gone by now.
Of course extrapolating backwards would solve the problem, quite easily of course, because it's basically stacking the deck, but Percy gave a positive number rather than extrapolating backwards and if erosion started tens of millions of years ago but it would only take one million or less to completely wipe out the formation, it should have been long gone and why there would be a question about this is hard to fathom. It didn't just start eroding, which would mean it would be gone in ten thousand years from now, it started eroding tens of millions of years AGO, what aren't you getting here?
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.

This message is a reply to:
 Message 529 by ringo, posted 06-29-2014 3:51 PM ringo has replied

Replies to this message:
 Message 541 by PaulK, posted 06-30-2014 4:56 PM Faith has replied
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Faith 
Suspended Member (Idle past 1444 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 539 of 1304 (731817)
06-30-2014 4:25 PM
Reply to: Message 537 by Pressie
06-30-2014 7:31 AM


Make your case, produce the evidence, or start a thread to discuss it Pressie.

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Faith 
Suspended Member (Idle past 1444 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 540 of 1304 (731818)
06-30-2014 4:45 PM


OK I get it, you're all assuming those monuments were bigger enough to have been eroding for tens of millions of years and still not disintegrated. Sigh. I look at them and fit them into a footprint that can't be as wide as the scree talus so I "know" they haven't been eroding that long.
So now we need to add girth to the things and see how big they had to be originally to have been eroding for all those millions of years and still not be eroded away. The thought makes me tired.
At least the hoodoos are confined to a measurable space where they were carved out of the cliff so we can't add endless amounts of material to them, though of course the OE mind is going to add all that to the freestanding monuments. Sigh.

Replies to this message:
 Message 542 by Percy, posted 06-30-2014 5:09 PM Faith has replied
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