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Author Topic:   Why is evolution so controversial?
Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 463 of 969 (724778)
04-20-2014 5:44 PM
Reply to: Message 458 by edge
04-20-2014 4:20 PM


... But if the layering in the oceans is supposed to represent more recent time periods, especially more recent than any found on land, I can't make any sense out of that at all.
I'm not sure why this is so hard. If the land is uplifted, sedimenation there stops, but continues in low areas filled with water.
How could there ever have been a Geologic Timescale at all then, or a Geologic Column to the depth of what we see in the GC-GS area? That is, how could there have ever been an actual COLUMN, a STACK of sediments that so reliably seems to show the sequence of time periods from one to another? That is, you seem to believe that there were many risings and fallings of land and/or sea during the laying down of the whole thing, and yet the deposition seems to have continued quite consistently through that whole three miles of depth or more, or in other words through those hundreds of millions of years from Precambrian to most Recent time.
I'm still trying to get this said so don't jump on any word problem you may find in it.

This message is a reply to:
 Message 458 by edge, posted 04-20-2014 4:20 PM edge has replied

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 468 of 969 (724803)
04-21-2014 2:12 AM
Reply to: Message 461 by edge
04-20-2014 5:21 PM


But the placement of these things seems to suggest a different order. For the Vishnu to be older seems a bit odd considering that it occupies the space which the strata of the Supergroup must have occupied in that same area originally by the look of it.
Well, then you need to explain why the Vishnu is metamorphosed by the granite but the 'older' GCSg escaped thermal metamorphism.
Fine, I can give it a guess, but you still need to explain how it got there at all if the schist was there first, the spatial problem. How do strata displace schist, or granite?
So I'd guess the Supergroup wasn't in the direct path of the hot magma, perhaps because lower layers got fried before that level was reached -- The rock beneath and around the identified rock isn't usually identified itself: more schist and granite?
Or because the strata in tilting slid beneath the upper stack which moved some strata into the magma's path and left some out of the magma's path. I have a picture of this in my mind and I haven't said it well, but maybe I'll try later. Some of it got metamorphosed, the rest didn't.
In any case, again, I can't see how the strata could have been laid down afterward.
You also need to explain why the Vishnu is intruded by the granite but the Unkar Group is not.
The way it got moved and tilted is still my best guess.
Keep in mind that the Cardenas intrusives cross-cut all of these units (Vishnu, Zoroaster Granite, and Unkar) so is later than all of them. This is pretty basic Geology 101.
Of course it's later, but that doesn't necessarily mean a LOT later. How about months later?
Those strata still exist at that same level after all, though broken and tilted in that small part of the area we get to see on the diagrams.
No.
Look closely at your diagram. The Zoraster includes pieces of the Vishnu, that means that it is younger than the Vishnu. Then you can see pieces of the Zoroaster in the Unkar, so the Unkar must be younger than the granite. Connecting these together, we have the following sequence Vishnu -> Zoroaster -> Chuar -> Cardenas, all followed by the Unkar, Tapeats, etc....
They may be at the same elevation, but they are definitely not of the same age. That would be 'tectonics' in action.
OK, I'm finding this too hard to follow right now, I'll have to come back to it.
You'd think they couldn't form at all if the area was already occupied by formerly metamorphosed sedimentary rock.
That's because the rocks have been uplifted, metamorphosed and deformed. Happens all the time. Even as we speak.
Which rocks, and how does this sequence make it possible for the strata to be laid down in neat horizontal sequence afterward?
Of course your dating methods will trump anything I have to say, but from the look of it I'd guess that the strata were laid down continuously with the strata above, and probably a lot deeper than we can see on the diagrams.
Well, they may trump what you say, but field relationships always trump radiometric ages. More Geology 101.
I'm very glad to hear it.
And then we got that tectonic disruption, along with the release of magma from beneath the crust, the strata at that lower level were broken, shoved, displaced, tilted, metamorphosed in part due to the volcanic heat and the pressure above; the magma also rose to form the granite which also occupies the same level beneath the Tapeats, ...
No.
Both the Zoroaster and Cardenas were emplaced before the Tapeats (see above). It is much more robust to say that the deformation occurred before the Tapeats, because we can see from the geometry of the Cardenas intrusives that they were also deformed along with the BCSg before the Tapeats.
I still have the problem of seeing how strata could have been laid down so neatly horizontal and parallel over such a lumpy base. Again I'm going to have to come back to this.
In fact, your diagram shows that there was erosion and deformation in between the Chuar and the Unkar as well.
Yeah but in my scenario all that sort of thing could be the result of the tectonic and volcanic upheaval that occurred after those strata were laid down, tilting and sliding things, abrading surfaces between each other and so on.
the whole disturbance raising the entire stack above the Tapeats which brought about quite the cataclysmic effects above the Kaibab, and there you have it.
Not likely.
In this case, as I've said before...
If you said it before in a post full of insulting remarks I may not have read it. FYI
...you need to have a major discontinuity between the Tapeats and all underlying rocks.
Which I'm supposing, aren't I? Or perhaps you need to be clearer about what this would look like.
We see such things elsewhere, but not here. They are called ovethrusts or decollements. They are quite well known and recognizable by even novice geologists.
I have some idea of what overthrusts are like from various online diagrams. They seem to be a more extreme tectonic folding of the strata than is seen in say angular unconformities where the folding may be more or less vertical, a series of sinuous bends, but the overthrust makes a bigger fold that lies more horizontal. The Great Unconformity is actually unusually horizontally tilted by comparison with other angular unconformities. Just a thought.
Do you want to know more about ovethrusts?
If you think it relevant, sure.

This message is a reply to:
 Message 461 by edge, posted 04-20-2014 5:21 PM edge has replied

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 469 of 969 (724804)
04-21-2014 2:26 AM
Reply to: Message 405 by edge
04-19-2014 11:23 AM


Re: granite schist and basalt
The Cardenas depiction is a bit confusing since it doesn't actually show the main occurrence of basalt, but even then this diagram is a clear indictment of the YEC viewpoint of the Grand Canyon.
Well, I'm an unusual YEC in that I try to explain what happened beneath the Tapeats as all the same event with the massive erosion from the Kaibab on up, including the cutting of the canyon and all the rest of it, which I think of as occurring just before the receding of the Flood or shortly afterward. Most YECs accept the idea that the Great Unconformity and everything else beneath the Tapeats was already there before the Flood began, and explain all the rest from there on up by the Flood. I put quite a bit of thought at one time into angular unconformities, starting with Siccar Point, as the buckling and tilting of a lower segment of strata while the upper stack was still in place, and that's still my favorite way of looking at it.
So don't blame YECs in general for my own attempts to explain things by the Flood that they know better than to try.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 470 of 969 (724807)
04-21-2014 4:11 AM
Reply to: Message 461 by edge
04-20-2014 5:21 PM


The order of deposition beneath the Tapeats
[I am returning to this part of your post which I left unanswered before]
...we have the following sequence Vishnu -> Zoroaster -> Chuar -> Cardenas, all followed by the Unkar, Tapeats, etc....
Both the Zoroaster and Cardenas were emplaced before the Tapeats
Some observations/questions:
1) There had to be sedimentary rock prior to the Vishnu schist, for the schist to form, correct? So why not the strata of the Supergroup?
It takes both heat and pressure to form, doesn't it? Or just heat? Wouldn't there also have to be pressure from above for it to form? Heat from the magma from below plus pressure from above? But you have the granite forming afterward, suggesting the magma didn't occur until afterward so where did the heat come from?.
The magma intruded into the schist and became granite, meaning of course it intruded after the schist was in place, but couldn't it have intruded before the schist was fully schist, when it was still sedimentary rock, and contributed to its becoming schist?
I come around to what I started with: The sedimentary rock from which the schist formed had to be there before the magma eruption which created the schist and the granite. If this sedimentary rock wasn't the strata of the Supergroup, what was it?
2) How could the Zoroaster granite form at all if there wasn't pressure from above, such as the strata from the Tapeats on up, to keep it confined? That is, shouldn't it have simply erupted in a lava flow covering the whole area, covering whatever was there before the Great Unconformity and the mountain range that supposedly built from that and so on? You've got the Vishnu there first, but the Vishnu doesn't intervene between the granite and the Tapeats.
In other words, the fact that there is granite there looks to me like evidence for the stack above it being already in place.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.

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 Message 461 by edge, posted 04-20-2014 5:21 PM edge has replied

Replies to this message:
 Message 473 by edge, posted 04-21-2014 10:43 AM Faith has replied

  
Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 474 of 969 (724828)
04-21-2014 11:51 AM
Reply to: Message 473 by edge
04-21-2014 10:43 AM


Re: The order of deposition beneath the Tapeats
1) There had to be sedimentary rock prior to the Vishnu schist, for the schist to form, correct? So why not the strata of the Supergroup?
An interesting idea, and I've seen it happen elsewhere, but there was a major regional fault between the sedimentary and metamorphic members.
I'm not getting the picture here. The fault made it possible for the sedimentary rock to be metamorphosed?
But not likely here. The Vishnu is mostly oceanic, whereas the Unkar is pretty much continental with conglomerates, dolomites, and quartzites; and there is an erosional unconformity between them.
So the Vishnu couldn't have been formed from the Unkar, part of the Supergroup, because of something to do with their content which you ascribe to different origins, although there they are cheek by jowl?
It takes both heat and pressure to form, doesn't it? Or just heat? Wouldn't there also have to be pressure from above for it to form? Heat from the magma from below plus pressure from above? But you have the granite forming afterward, suggesting the magma didn't occur until afterward so where did the heat come from?
The same place it comes from today. Most likely the upper mantle. In this case, the heat could have been the same thermal event, but carried out over a very long time. I don't know, offhand, the absolute ages of the Vishnu compared to the Zoroaster.
In other words you have to make up a source for which there is no clear evidence, whereas what I suggested has a clear source in the magma which is clearly present beneath these formations, which DOES come from the mantle anyway.
The magma intruded into the schist and became granite, meaning of course it intruded after the schist was in place, but couldn't it have intruded before the schist was fully schist, when it was still sedimentary rock, and contributed to its becoming schist?
Depends on textural relationships. It's not all that important, anyway. The rocks had to cool and be eroded before the Unkar was deposited. This probably took on the order of hundreds of millions of years.
I know... you simply can't believe it.
Actually it's always easier to believe in huge spans of time, that seems to cover just about any contingency imaginable, but yes, I'd guess there is no need for that much time to cool the rocks.
I come around to what I started with: The sedimentary rock from which the schist formed had to be there before the magma eruption which created the schist and the granite. If this sedimentary rock wasn't the strata of the Supergroup, what was it?
An earlier ocean basin.
A totally fictitious ocean basin for which there is no evidence whatever is the supposed source of sedimentary rock which metamorphosed into the Vishnu schist.
This idea plus the heat from the mantle answer above are clearly the product of Old Earth assumptions and not actual evidence.
2) How could the Zoroaster granite form at all if there wasn't pressure from above, such as the strata from the Tapeats on up, to keep it confined?
Consider that the heat flows were probably higher at that time and also that there is an unknown amount of rock eroded form above the Zoroaster pluton.
More fiction, edge, more speculation based on your Old Earth assumption and not on evidence. Heat flows were "probably" higher at that time, you don't know but it seems probable on OE assumptions, and an "unknown," i.e., purely fictitious made-up, amount of rock must be postulated to have existed, for which there remains not a shred of actual evidence.
So this creates the necessary pressure to keep the magma confined so that it can form granite? Must have been a LOT of rock. Maybe on the order of the two mile depth of the strata from the Tapeats up? Interesting how the granite seems sort of to press up against it too, kind of flattened out at the top there. Magma doesn't always incinerate everything in its path it seems, judging by the dikes and sills one sees penetrating through the strata here and there, even when they go all the way up through to the very top as at the north end of the Grand Staircase where they then flow out into a lava field.
A side thought occurs: that there is a magma dike associated with Siccar Point too, quite exposed at the front of the formation. Just something to wonder about in connection with angular unconformities in general.
That is, shouldn't it have simply erupted in a lava flow covering the whole area, covering whatever was there before the Great Unconformity and the mountain range that supposedly built from that and so on?
Possible, but all eroded away now.
Another completely made-up happening: if it was there it's now gone. But of course I don't think that happened, I think the magma was confined beneath the Tapeats because of the great weight of strata above it and I don't see that you have accounted for the necessary pressure.
I see no evidence that the Zoroaster reached the surface,
Nor do I.
but by comparison with younger plutons, it probably did. In fact, there are more oceanic intrusions associated with the Vishnu that indicate even earlier extrusive volcanism.
What is an "oceanic intrusion?" Sounds like something that might fit well with a worldwide Flood scenario.
You've got the Vishnu there first, but the Vishnu doesn't intervene between the granite and the Tapeats.
No it doesn't.
In other words, the fact that there is granite there looks to me like evidence for the stack above it being already in place.
Only if you ignore the erosional unconformtity between them. Then you have to ignore the Unkar Group and the Chuar Group and the erosional unconformities between them. And then there's the Cardenas event...
I have no intention of ignoring anything, I'm simply addressing one aspect of the situation at a time. I already suggested an explanation for the erosion.
And, you will notice that I haven't even discussed the absolute (radiometric) ages...
You don't need to, your Old Earth assumptions supply all the justification you need for your fictional scenario.
I suppose I'll deal with your other posts next but as usual the situation is only too clear. Your fictions are going to trump anything I might suggest, because that's the way it goes with a science that deals with the prehistoric past, which is built out of speculations and interpretations. I do keep being astonished at the agility of such purely fictional explanations. Comes down to Whoever has the power wins.
And of course I "deserve" to be treated to extreme personal insults because I question the thinking of geologists, just their theories, not their persons. So that's the way it is.
Edited by Faith, : No reason given.

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 Message 473 by edge, posted 04-21-2014 10:43 AM edge has replied

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 476 of 969 (724833)
04-21-2014 12:44 PM
Reply to: Message 475 by edge
04-21-2014 12:16 PM


Re: The order of deposition beneath the Tapeats
Don't see any evidence for your assumptions, they're just the usual Old Earth assumptions, conjured out of thin air. You have about half a dozen purely fictitious speculations in that post for which there is no evidence whatever, based on your own wording, ALL OF WHICH I POINTED OUT IN MY RESPONSE, given in answer to my speculations based on what is actually present. You've certainly provided no source of the pressure needed to form the granite, though there is ample pressure from the weight of the strata in my scenario.
But whatever, yes we're done here, done to a crisp I'd say. Though I may yet come back to earlier posts.
Edited by Faith, : No reason given.
Edited by Faith, : No reason given.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


(1)
Message 486 of 969 (724873)
04-21-2014 10:35 PM
Reply to: Message 481 by Coyote
04-21-2014 6:16 PM


Re: Back on topic
Summary: Evolution is "controversial" only to those who won't accept it for religious reasons, and who do their best to generate "controversy" because of that.
The fact of the matter in my case is that years before I became a Christian, when I still considered myself an atheist, I read the usual popular accounts of evolution and at times tried to track down the evidence for it. It always seemed to disappear into assertions and assumptions. That didn't keep me from continuing to believe in it, I had no religious objections to it, but it was frustrating, and once I did become a Christian and read some books on creationism I could see why it's so frustrating: the evidence for it IS only assertions and assumptions.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


(1)
Message 489 of 969 (724876)
04-21-2014 10:45 PM
Reply to: Message 479 by frako
04-21-2014 1:35 PM


There are scientific arguments against evolution
they're just the usual Old Earth assumptions
And what evidence do you have for a young earth?? Or do you just assume its young, cause it fits your biblical world view.
I've made case after case based on various observations of such things as the strata, the fossils and the decrease in genetic diversity that is the necessary result of microevolution. ABE: I emphasize: These arguments have been made on observations of facts, not theory, not assumptions etc. /ABE
Dendrochronology the study of tree rings can push the date of the earth back to a little over 11000 years.
European Project for Ice Coring in Antarctica (EPICA) has an ice core that goes back 740 000 years, 3270 meters of layered ice (light ice dark ice, ie winter summer).
I grant that both of these phenomena appear to support an Old Earth, at least an older Earth than the Biblical Young Earth. There are phenomena on both sides of the question it seems to me.
But you don't care because you assume the bible is the word of god, And if you count how long the people lived and add it up it was 6000 years ago when Adam was talked in to eating an apple by a talking (also walking at the time) snake. And you have the nerve to claim we are making unbased assumptions.
I SHOWED that some are making unbased assumptions. And I KNOW the Bible is the word of God.
Edited by Faith, : No reason given.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 504 of 969 (725419)
04-27-2014 2:33 AM
Reply to: Message 501 by Percy
04-26-2014 7:14 AM


Re: Percy bogusity from message 400 and 412
The way it was put it was a bald assertion, even a wild guess by the sound of it.
That 280 my statement is REALLY bizarre. I'm going with that quote that came up somewhere back there that said they were getting false readings on the age of the basement rocks of the GC perhaps because of water content or something like that. if water content can mess up a reading, just THINK of all the errors you guys are refusing to consider.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 512 of 969 (725494)
04-27-2014 7:23 PM
Reply to: Message 511 by Archer Opteryx
04-27-2014 4:43 PM


Re: No scientific controversy exists.
Whooee, was that INSPIRING! A lot of assertive words there, declaring the status quo, but not much in the way of truth.

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Faith 
Suspended Member (Idle past 1474 days)
Posts: 35298
From: Nevada, USA
Joined: 10-06-2001


Message 517 of 969 (725618)
04-29-2014 2:54 PM
Reply to: Message 513 by Capt Stormfield
04-27-2014 8:20 PM


Re: No scientific controversy exists.
Perhaps you could point out a falsehood in Archer's post and reference your source for thinking it so.
Why not. Here's his post:
The theory of evolution is a bedrock principle of modern biological science.
Well, it's a thoroughly ossified thoroughly accepted not-to-be-questioned principle of modern biological science, assumed and embellished at every turn, but "bedrock" in the sense that it actually contributes any meaningful knowledge of biology? No. All it contributes is more fleshing out of the evolution assumption. It hangs on biology like a parasite getting fatter all the time but biology benefits not a whit.
Source: Intelligent observation.
Science is learning how evolution happens. You'll see some debate there.
I'm not sure how to read this. Science is to be defined as learning how evolution happens, or science is contributing to knowledge about how evolution happens. Either way I have to object. Again, evolution is a parasite on the sciences, the only learning it contributes is an elaboration of the fantasy it embodies.
Source: Cynical me.
No scientists debate whether evolution happens. That's established.
Certainly true there's no debate about this, it's as good as planted in concrete, but "established" of course raises the question "by what means" and the answer is by assumption and habit, certainly not by real evidence.
Source: Creationist wisdom.
No scientific controversy exists.
Not among the True Believers, that's for sure.
The only controversy is political. In certain pockets of certain societies, some people don't want their kids to learn the science.
Evolution is not true science, it's an elaborated endlessly elaboratable mental construct built out of hot air, so it's really best that it not be foisted on children, but actually many people don't mind if they learn the fantasy TOO.
Some of these people employ a bait-and-switch tactic in which they kick up a lot of sand--thereby creating political controversy--then talk of 'controversy' among scientists, as if it existed. They hope the public won't catch the difference.
Ooo what a jaundiced paranoid viewpoint that is. In my experience there ARE creationist scientists who do object scientifically to evolution, and many of them don't get into the political angle of it at all.
Evolution is science.
Evolution is taken for science, unfortunately, terrible flimflam that.
It is taught in any science class worthy of the name, worldwide.
This is true, sad to say.
Source: Honest perspicacious creationist me.
Edited by Faith, : No reason given.

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