Angular Unconformities

[ardipithecus]

Here is a 200 year old illustration of the Hutton Unconformity:

The Grand Canyon threads note such an angular unformity in the Grand Canyon. 

Such structures immediately falsify any Flood Geology that requires the Earth (or the fossil bearing formations) be under 10 thousand years old.   

It is thus not surprising how dead quite the YECs are on the subject. 

The question becomes to any YEC: how can an angular unconformity form?

 

 

 

[lucaspa]

Today at 09:54 PM ardipithecus said this in Post #1

Here is a 200 year old illustration of the Hutton Unconformity:

The Grand Canyon threads note such an angular unformity in the Grand Canyon. 

Such structures immediately falsify any Flood Geology that requires the Earth (or the fossil bearing formations) be under 10 thousand years old.   

It is thus not surprising how dead quite the YECs are on the subject. 

The question becomes to any YEC: how can an angular unconformity form? 

Nice. I'll have to remember this one. What's the original source of the picture, Ardipithecus?  Did you get it off the web or scan it?

 

[ardipithecus]

I scanned it.  Though it is very easy to find.  You can find it in Time's Arrow, Time's Cycle by Gould.  It is also in Basin and Range by John McPhee.  That book can found as a book or in the five-book omnibus Annals of the Former World which won the Pulitzer.   It was originally in John Playfair's Illustrations of the Huttonian Theory of the Earth published in 1802.

 

 

[ardipithecus]

Here is a generalized diagram of an angular unconformity:

As mentioned before there is a rather famous angular unconformity at the Grand Canyon.  The GC has other types of unconformities as well:

AU = Angular Unconformity

NC = Nonconformity

LU = Local Unconformity

D = Disconformity

And just as I ask how an angular unconformity could work in Flood Geology, I could ask the same for the local unconformity (indeed the problem is even bit worse for the YECs for that type).  Or for that matter the local unconformity plus the angular unconformity.  And then there is the nonconformity and several disconformities.

Just on the basis of these features one must have many cycles of sediment being laid down followed by erosion followed by sediment being laid down.


Source of these two images


 

 

[Gracchus]

The creationists seem to be staying away in droves!  Why am I not surprised?

 

[webboffin]

maybe folks don't know what the heck is being said here

 

[ardipithecus]

Today at 05:30 AM webboffin said this in Post #6

maybe folks don't know what the heck is being said here

It seems simple enough to me.

How does something like this

form?

And apply the lesson to the Grand Canyon.

 

 

 

 

[LewisWildermuth]

Today at 09:30 PM webboffin said this in Post #6 (http://www.christianforums.com/showthread.php?postid=668704#post668704)

maybe folks don't know what the heck is being said here

And that is sad since angular uncomformities are geology 101 and high school level stuff...

 

[webboffin]

.....and what about it?

 

[Mechanical Bliss]

Angular unconformities like those pictured above illustrate how older rocks are tilted or folded by tectonic processes, are eroded, and younger sediments are deposited on that erosional surface and are lithified. An example of this is near the bottom of the Grand Canyon.

The "what about it" part was already mentioned by ardipithecus (as it is in the other Grand Canyon threads): these features falsify the notion that the Earth's geology can be explained by a global flooding event (particularly one that lasted a year or less, according to Young Earth Creationists) on an Earth less than 6-12 thousand years old.

The point is that YECs have yet to address how a geologic feature like this could form under the assumption of their Earth model (as well as other features listed in other recent geology threads).

 

[ardipithecus]

Yesterday at 03:13 PM webboffin said this in Post #9

.....and what about it?

That the line of the angular unconformity represents -- MUST represent --- a time which the land was being eroded.

Layers form. Layers are uplifted (or sea goes down) and land is tilted and eroded.  Land goes down (or sea goes up) and more strata is laid.  Land goes up again (or sea goes down).  In case of the Grand Canyon add then canyon gets cut.

 

 

[webboffin]

I see

 

[ardipithecus]

I found another image of the unformities of the Grand Canyon.  This image should make it obvious why the disconformities represent times of erosion:

 

 

[ardipithecus]

This diagram will make the disconformities even clearer (look at the layer called the Redwall Limestone):

 

Image comes from this page.

 

 

[ardipithecus]

I guess I should have called this thread "unconformities" and not "angular unconformities." 

Thus far we have shown that the Grand Canyon has a number of unconformities.   As the reader should know by know, an unconformity is where erosion has removed material in the past.  However the previous diagrams might give people the implication that there are far fewer unconformities in the Grand Canyon then there really are. 

For example the Supai group is shown in the previous images are shown without any unconformities in it.  However lets take a close look at the Supai group:

I scanned this from The Supai Group of Grand Canyon.  (The title really does have no "the" in it.) It is by Edwin D. McKee and is U.S. Geologic Survey Professional Paper 1173 and was published in 1982.  McKee provided many diagrams and photos of the unconformities (erosional surfaces) indicated in the above image.  There are very clear disconformities.  Indeed each of these have river channels in them. 

So Noachian Deluge fans, is the Supai group formed before, during, or after the Flood?

 

 

[ardipithecus]

No YEC wants to comment? Maybe they are conceding that the Earth is far older than a few thousand years old.

After all unconformities are such an obvious disproof of their "geology."

 

[ardipithecus]

 

Here is a photo of the Hutton Unconformity from message one:

Here is an angular unformity from Texas:

 

 

[ikester7579]

20th February 2003 at 09:54 PM ardipithecus said this in Post #1

Here is a 200 year old illustration of the Hutton Unconformity:

The Grand Canyon threads note such an angular unformity in the Grand Canyon. 

Such structures immediately falsify any Flood Geology that requires the Earth (or the fossil bearing formations) be under 10 thousand years old.   

It is thus not surprising how dead quite the YECs are on the subject. 

The question becomes to any YEC: how can an angular unconformity form?

 

 

As someone ask me once: This is quite old, do you have anything newer?

 

[ikester7579]

And how long did it take for granite rocks to appear? If you bust one open, you will find a radio isotope rings inside. Since an radio isotope half life is less than 5 seconds, how could these rings get caught in every granite rock? Seems like a sudden formation happened. Funny how old earth evolutionist don't address this.

 

[webboffin]

Seems funny to me that this subject is brought up to dispell another. But anyways.