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Author Topic:   Origin of the Flood Layers
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Message 332 of 409 (753484)
03-20-2015 10:07 AM
Reply to: Message 285 by Faith
03-19-2015 12:58 PM


Moderator Concern
Faith writes:
Yup, very adept at spieling the party line.
Again, please, not as a message's sole content. Also, consider how it looks. You're dismissing "examining, evaluating and appreciating converging lines of evidence" as the "party line" when it is actually just part of how anyone would want to approach the understanding of anything.

--Percy
EvC Forum Director

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Message 334 of 409 (753488)
03-20-2015 10:22 AM
Reply to: Message 292 by edge
03-19-2015 2:16 PM


Moderator Request
edge writes:
I have shown you where they came from. It doesn't look like this picture.
By the time I read this I no longer remembered what "this picture" is of. Posting the image again would have been very helpful, in many posts, not just yours.
Also, and I know I'm asking a lot, but I'm having a great deal of difficulty following your posts because of the brevity of the responses. I understand the desire to be economical in investing one's time given past history, but if you're going to participate then it's worth giving it your full effort. In for a penny in for a pound, as they say.

--Percy
EvC Forum Director

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Message 336 of 409 (753490)
03-20-2015 10:26 AM
Reply to: Message 293 by edge
03-19-2015 2:21 PM


edge writes:
I don't know what to tell you. I see continuous bedding in very soft sedimentary rocks that have been eroded into rather fanciful forms. In the foreground the bedding is vertical and in the distance it is tilted to the left.
Noting again that I'm reading and responding to posts in order and haven't read ahead to see if this issue has been resolved, I think Faith wants to understand how geology thinks the bedding came to be tilted so much as to be vertical in some places, i.e., 90° rotated from its original orientation.

--Percy
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Message 339 of 409 (753494)
03-20-2015 10:33 AM
Reply to: Message 303 by Faith
03-19-2015 10:08 PM


Moderator Info
Though I'm replying to Faith, I'm really just calling attention to something Faith believes that might be worth addressing. She indicates here her belief that rocks form by drying:
Faith writes:
So I figure the quartz chunks in the picture we are discussing would have been broken out of such a vein here too, with the aid of wet or drying sand that seems to have had a sticky quality to it, at least while it was drying and hardening which I've suggested it did while lying over the quartz vein, then gradually pulling pieces of the quartz with it as it dried and hardened more, shrinking and retracting from the position over the vein.

--Percy
EvC Forum Director

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Message 349 of 409 (753504)
03-20-2015 11:05 AM
Reply to: Message 328 by jar
03-20-2015 9:59 AM


Re: Formation of schist etc.
jar writes:
But Faith, you still have not presented a model. Let's try baby steps.
Faith presented a pretty detailed description of what she thinks happened, so couldn't we consider that as her model? Anyway, naturally it raises some questions, which you go on to do.

--Percy
EvC Forum Director

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Message 351 of 409 (753507)
03-20-2015 11:16 AM
Reply to: Message 338 by edge
03-20-2015 10:31 AM


Re: Moderator Clarification
edge writes:
She wants to know how pieces of quartz broken off from the veins of quartz embedded within the Vishnu Schist came to be deposited atop the Vishnu Schist.
Probably much the same way as they would look as if they fell out of the cliff face shown and ended up in the river sediments below.
Does that help clarify things,...
It does help a bit, but not enough. It just feels like something's missing. How is it that in the distant past there was a cliff of Vishnu Schist towering above a riverbed of Vishnu Schist? I can only guess at the answer, but I assume it's one that must be very obvious to you. My guess is that the river eroded down through the Vishnu Schist, creating the cliff faces from which pieces of quartz broke off. But once I come up with that guess I question it, because if that was the case then where is that ancient cliff face now?

--Percy
EvC Forum Director

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Message 366 of 409 (753557)
03-20-2015 2:51 PM
Reply to: Message 354 by edge
03-20-2015 11:25 AM


Re: Moderator Clarification
Hi Edge,
Yeah, you got it, thanks for the clarifications.
You were wondering why I chose the scenario of a cliff face towering over a riverbed, and that was because you said, "Probably much the same way as they would look as if they fell out of the cliff face shown and ended up in the river sediments below," and the "cliff face shown" was this one:
So in my reply I tried to be consistent with that pictured scenario of a cliff face over a riverbed. I understand it doesn't have to be a cliff face, just a difference in height. But it's the difference in height combined with the transport that is a part of the scenario that I think many people will miss when you say that the material atop the Vishnu Schist is from the Vishnu Schist. I think many will assume you mean it came from that exact spot of the Vishnu Schist, or perhaps just be confused.
Also, the material coming off that cliff face can be from other layers above the Vishnu Schist. We can only see Vishnu Schist in that photo, but somewhere above out of view are other layers. It's another part of the potential confusion that when it is said about that clast photo that when clasts from the lower layer are found embedded in the layer above that it is evidence of an unconformity, many will conclude that you mean the clasts always have to be from that lower layer. They don't. They could be from some layer above that layer, and even possibly below that layer depending upon how "interesting" the geological history has been.

--Percy
EvC Forum Director

This message is a reply to:
 Message 354 by edge, posted 03-20-2015 11:25 AM edge has replied

Replies to this message:
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Message 367 of 409 (753560)
03-20-2015 2:57 PM
Reply to: Message 364 by edge
03-20-2015 2:09 PM


Moderator Request
Please use PM's if you want to discuss other participants and their contributions.

--Percy
EvC Forum Director

This message is a reply to:
 Message 364 by edge, posted 03-20-2015 2:09 PM edge has not replied

  
Admin
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Posts: 12996
From: EvC Forum
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Message 409 of 409 (753771)
03-22-2015 7:18 AM


Moderator Note
I'd very much like to play a more active role in this thread, but I'm unfortunately very busy again today. I'll monitor the Report Discussion Problems Here 4.0 thread, I'd appreciate it if issues concerning this thread are posted there.

--Percy
EvC Forum Director

  
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