Register | Sign In


Understanding through Discussion


EvC Forum active members: 64 (9164 total)
4 online now:
Newest Member: ChatGPT
Post Volume: Total: 916,822 Year: 4,079/9,624 Month: 950/974 Week: 277/286 Day: 38/46 Hour: 0/3


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
Author Topic:   Evidence that the Great Unconformity did not Form Before the Strata above it
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1550 of 1939 (757123)
05-03-2015 3:30 PM
Reply to: Message 1548 by Admin
05-03-2015 3:10 PM


Re: Moderator Facilitation
I think it's safe to conclude that everyone already understood that you believed the layers on the left "sagged when still soft."
I think that everyone agrees on this. It's just kind of a red herring that Faith keeps tossing out. I would say that they were very soft, probably deposited that way or compacted during lithification.
The real question is the mechanism and its timing. Faith has not provided any evidence for her scenario, but simply said that 'it looks like', based on some convoluted biblical interpretation.

This message is a reply to:
 Message 1548 by Admin, posted 05-03-2015 3:10 PM Admin has seen this message but not replied

Replies to this message:
 Message 1551 by Faith, posted 05-03-2015 3:39 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


(1)
Message 1552 of 1939 (757127)
05-03-2015 3:55 PM
Reply to: Message 1551 by Faith
05-03-2015 3:39 PM


Re: Moderator Facilitation
I defy you to show I ever used a "convoluted biblical interpretation" in discussing the sagging layer.
Okay, an 'inaccurate biblical interpretation'. Your arguments, however, are convoluted.

This message is a reply to:
 Message 1551 by Faith, posted 05-03-2015 3:39 PM Faith has replied

Replies to this message:
 Message 1553 by Faith, posted 05-03-2015 3:56 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


(1)
Message 1555 of 1939 (757130)
05-03-2015 6:12 PM
Reply to: Message 1553 by Faith
05-03-2015 3:56 PM


Re: Moderator Facilitation
I have never used ANY biblical interpretation.
That's interesting. I wonder who wrote these sentences then.
Message 641 "What you are calling reality cannot contradict the Bible or it is not reality, and both Old Earthism and evolution contradict the Bible."
Message 938 "Of course I mean what if you're wrong, and that really it's the Bible that tells the truth about the world and that scientific evidence must be false where it contradicts it?"
Message 952 "IF tectonic movement occurred, what I KNOW is that it had to occur within the Biblical time frame."
Message 1276 "I start from the fact that a worldwide flood as described in the Bible couldn't possibly act like any local flood except in very brief temporary episodes at the very beginning."
Message 1285 "My view of the pre-Flood world is pretty standard, my view of the Flood events within the usual ballpark, all of it perfectly reasonable based on the Bible."
And there are more...
Message 674
Message 798
Message 864
Message 872
Message 875
Message 1234
Message 1480

This message is a reply to:
 Message 1553 by Faith, posted 05-03-2015 3:56 PM Faith has replied

Replies to this message:
 Message 1558 by Faith, posted 05-03-2015 8:13 PM edge has not replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1572 of 1939 (757177)
05-04-2015 1:31 PM
Reply to: Message 1570 by Faith
05-04-2015 1:12 PM


Re: Moderator Facilitation
Okay, I'm not going to debate a picture. There's too much going on from perspective, to blasting damage, to shadows, to geological history. Sometimes, I think we are talking about different parts of the picture, or even different pictures.
The real issues are Faith's blunders of knowledge and interpretation of the constellation of geological data surrounding the Great Unconformity.
It's one of a stack of horizontally deposited layers. The tilt on the left obviously occurred after the stack was all laid down: see very straight slightly tilted contact line on layer above.
If there is actual folding or deformation, I would expect it to propagate into the upper layers.
I never think in terms of layers deposited on a slope. This is the Stratigraphic Column.
No, it is a road cut in the local stratigraphy.
There are no such layers. They all deposited horizontally and deformations occurred after they were laid down, in example after example. Deformation means plasticity which requires that the rock not yet be lithified. The layer did not break, it sagged.
Factually wrong. To a geologist, all rocks are plastic.
I didn't. I suppose that it was tectonic force that messed up the gneiss and disturbed the layers above, especially on the left where they tilt and sag.
So, how do you explain the vast difference in deformation and metamorphic grade of the gneiss versus the sandstone?

This message is a reply to:
 Message 1570 by Faith, posted 05-04-2015 1:12 PM Faith has replied

Replies to this message:
 Message 1577 by Faith, posted 05-04-2015 1:47 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1574 of 1939 (757179)
05-04-2015 1:36 PM
Reply to: Message 1571 by Faith
05-04-2015 1:15 PM


Re: Caves
Sigh. They look like broken contacts to me and I'd bet you about it, But since you are inclined to argue I'll just require you to prove your argument. That would take light and a camera for a good closeup.
This is why I have decided not to debate a photograph, particularly with a person who has poor vision.
I will, however, say that the only times I have seen such a phenomenon are where there has been erosion or dissolution of the underlying layer. If this happened as Faith says, particularly before lithification, something would be deposited in the space created.

This message is a reply to:
 Message 1571 by Faith, posted 05-04-2015 1:15 PM Faith has replied

Replies to this message:
 Message 1575 by Faith, posted 05-04-2015 1:39 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1576 of 1939 (757181)
05-04-2015 1:43 PM
Reply to: Message 1575 by Faith
05-04-2015 1:39 PM


Re: Caves
A bit of rubble perhaps. Just not a nice tight contact.
If the rocks were plastic, you wouldn't have rubble.

This message is a reply to:
 Message 1575 by Faith, posted 05-04-2015 1:39 PM Faith has replied

Replies to this message:
 Message 1578 by Faith, posted 05-04-2015 1:49 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


(1)
Message 1579 of 1939 (757184)
05-04-2015 1:56 PM
Reply to: Message 1577 by Faith
05-04-2015 1:47 PM


Re: Moderator Facilitation
So would I and it did: but in this case it propagated only to the slight tilting of the layers immediately above the sag.
Which is a characteristic of draping or soft sediment compaction...
That does show propagation, however. Apparently the stack was stable enough not to be more disturbed above that point.
No, the whole section. This is not a forced fold.
I'm sure I got the term "plastic" from a geology site. It means what I'm saying it means. Why can't you just leave well enough alone and cut the obsessional and obfuscating pedantry?
Because it shows that you are not precise in your language and that causes confusion.
And yeah, it's a road cut IN the Stratigraphic Column. More nitpicking pedantry.
No, that's not what I wrote. YECs do not understand what the stratigraphic column is and it causes miscommunication. And if there is one thing we know about your threads, there is a lot of confusion.

This message is a reply to:
 Message 1577 by Faith, posted 05-04-2015 1:47 PM Faith has replied

Replies to this message:
 Message 1581 by Faith, posted 05-04-2015 2:05 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1580 of 1939 (757185)
05-04-2015 1:57 PM
Reply to: Message 1578 by Faith
05-04-2015 1:49 PM


Re: Caves
Fine. No rubble, just a hole.
Which is exactly what I said we do not see.

This message is a reply to:
 Message 1578 by Faith, posted 05-04-2015 1:49 PM Faith has replied

Replies to this message:
 Message 1582 by Faith, posted 05-04-2015 2:07 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1584 of 1939 (757189)
05-04-2015 2:14 PM
Reply to: Message 1581 by Faith
05-04-2015 2:05 PM


Re: Moderator Facilitation
Google Images of the
Stratigraphic Column as I understand it.
Perhaps you are the one who is confused. Which is the usual case though you like to blame it on me.
As I said. The Stratigraphic Column is a diagram, a representation.

This message is a reply to:
 Message 1581 by Faith, posted 05-04-2015 2:05 PM Faith has not replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1585 of 1939 (757190)
05-04-2015 2:15 PM
Reply to: Message 1582 by Faith
05-04-2015 2:07 PM


Re: Caves
Perhaps you need your eyes examined.
Off topic, personal reference.
Please focus.

This message is a reply to:
 Message 1582 by Faith, posted 05-04-2015 2:07 PM Faith has not replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1587 of 1939 (757192)
05-04-2015 2:22 PM
Reply to: Message 1583 by herebedragons
05-04-2015 2:10 PM


Re: Tight tilted contacts
Your logic puzzles me... If the orange lines and yellow lines were once parallel and the orange lines "sagged" or pivoted down to the left after the whole (or most of the) stack was already above it, shouldn't there be "gap" somewhere between the orange and yellow lines?? Instead that contact is seamless, barely even a crack between them.
Good point. If Faith is correct, and there is a gap caused by sagging where everyone else sees shadows, then there should be another shadow (er ... gap) where you are discussing.

This message is a reply to:
 Message 1583 by herebedragons, posted 05-04-2015 2:10 PM herebedragons has replied

Replies to this message:
 Message 1595 by herebedragons, posted 05-04-2015 3:01 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


(1)
Message 1600 of 1939 (757217)
05-04-2015 10:01 PM
Reply to: Message 1595 by herebedragons
05-04-2015 3:01 PM


Re: Tight tilted contacts
This whole issue of "soft" rocks is bothering me too. I addressed it a little bit in Message 1593, but maybe you could address it in a bit more detail. Especially (I am curious as well) how sandstone would be expected to behave if it was only partially lithified - like say 10% of the grains were cemented or 20%, something like that. It wouldn't be hard like fully lithified rock, but it wouldn't be like clay either.
I wouldn't say that it bothers me, I just don't see the relevance. I have no problem with the sediments being soft upon deposition or during later deformation. As I have said, the issue is, 'where is the evidence for deformation?'
Lithification is just another one of those processes that YECs can't seem to understand. Uncemented sand is free-running in the presence of water. From there it becomes more and more solid, being crumbled to sand grains by rubbing with fingers to being so solid that fractures cut through the grains themselves (quartzite). In the field these various states can show up as increasing ages of the rocks. In other words, the Shinumo should be harder than the Tapeats, which would be harder than the Coconino, which would be harder than the Navajo, and on and into the modern sediments in the Colorado River. There are other factors such as the composition of the cement and thermal history, etc. And it shows up as how the rock breaks. In engineering geology it's just basic 'hardness' and there are scales/tests to determine relative hardness.
And are there examples of rock that has only been partially lithified? I suspect not since it needs to be buried deeply for the process to happen and so is unlikely to be exposed before completion, but I suppose it could happen.
Sure. There was a recent picture of a laminated sandstone from Mars for instance. Just looking at the picture, I can tell you exactly how it would feel in my hand. That's just because I've seen so many of these things.
This Martian sedimentary rock is probably a very soft as the wind is presently re-eroding it to sand.
I do realize there are poorly cemented sandstones, but I think that is different than partially lithified, right?
Cementation is part of the process of lithification. It occurs along with pressure and heat. And time...
Because lithification is a process, I do not draw a distinct line at which point a sediment becomes a rock. I have no problem with Faith saying that the rock was soft when it came to its present geometry. I just disagree on when it happened and how.
Edited by edge, : No reason given.
Edited by edge, : No reason given.
Edited by edge, : No reason given.

This message is a reply to:
 Message 1595 by herebedragons, posted 05-04-2015 3:01 PM herebedragons has not replied

Replies to this message:
 Message 1601 by Admin, posted 05-05-2015 6:48 AM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1603 of 1939 (757223)
05-05-2015 8:49 AM
Reply to: Message 1601 by Admin
05-05-2015 6:48 AM


Re: Moderator Clarification
This might be interpreted to mean that (b) is what happens in this illustration of sedimentation:
I see. It should be "when disturbed or in excess of the angle of repose".
I think you're referring to the geometry of the layers, but this might be interpreted to mean that when the geometry of the Grand Canyon came to be, you have no problem with statements that the rock was still soft.
Just the 'sagged' layers.

This message is a reply to:
 Message 1601 by Admin, posted 05-05-2015 6:48 AM Admin has seen this message but not replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1604 of 1939 (757241)
05-06-2015 10:41 AM
Reply to: Message 1597 by herebedragons
05-04-2015 3:09 PM


Re: Tight tilted contacts
What her drawing does not capture is that the angle of the layers she represented with orange lines get progressively steeper. The layer above it is not as horizontal as the yellow line, but not as steeply angled as the orange lines. The contact between the grey stone and the tan stone is even more steeply angled.
I don't really want to get into an argument about what pictures show, but I thought, since things are slow, I'd show what I see in the New York roadcut picture.
What I am looking at are bedding planes. Those are the nearly horizontal lines cutting across the outcrop.
In this picture I'm seeing excactly what HBD is seeing: steeper inclinations of the bedding as we go down the left side of the picture.
But one thing that strikes me is that the bedding planes are continuous over the allegedly disturbed area we have been discussing. In particular, look at the orange line about half way up the image. It is perfectly continuous all the way across the outcrop with very little deflection. To me, this along with the upward disappearance of the bending, indicates that there is no fault that has forced the gneiss upward into the sedimentary package as Faith has proposed.
My other lines, might be subject to interpretation along with the red original line, but the orange highlighted bedding plane is compelling.

This message is a reply to:
 Message 1597 by herebedragons, posted 05-04-2015 3:09 PM herebedragons has not replied

Replies to this message:
 Message 1605 by Admin, posted 05-06-2015 12:18 PM edge has replied
 Message 1611 by Faith, posted 05-06-2015 4:41 PM edge has replied
 Message 1632 by Minnemooseus, posted 05-06-2015 7:20 PM edge has replied

  
edge
Member (Idle past 1733 days)
Posts: 4696
From: Colorado, USA
Joined: 01-09-2002


Message 1606 of 1939 (757257)
05-06-2015 2:44 PM
Reply to: Message 1605 by Admin
05-06-2015 12:18 PM


Re: Moderator Clarification
I think Faith's position is that the bending disappears gradually in the higher layers because, being soft, the material pushed to the side away from the point of bending. The rougher appearance of darker rock in the center of the image is a record of this disturbance.
Maybe we will see if this is what she thinks.
In that case, I would argue that bedding planes should become indistinct over the bend and there should be some kind of flow structure within the beds of sandstone. When the beds are forced aside like that, they typically vary in thickness rapidly and develop some kind of forced folds.
As to the roughness of the outcrop at that location, I think we are at a disadvantage in not seeing the outcrop in person. There are several explanations including short blast-holes in that area allowing natural fractures to dictate the shape of the exposure.

This message is a reply to:
 Message 1605 by Admin, posted 05-06-2015 12:18 PM Admin has seen this message but not replied

Replies to this message:
 Message 1609 by Faith, posted 05-06-2015 4:30 PM edge has replied

  
Newer Topic | Older Topic
Jump to:


Copyright 2001-2023 by EvC Forum, All Rights Reserved

™ Version 4.2
Innovative software from Qwixotic © 2024