Evidence

[Spud]

https://ncse.com/blog/2014/11/top-5-creationist-claims-grand-canyon-1-great-unconformity-0015968

I would suggest the duck test for the great unconformity. If it doesn't look as though a billion years separate two layers, it's most likely that they didn't!

[Sebastian Toe]

I would suggest the duck test for the great unconformity. If it doesn't look as though a billion years separate two layers, it's most likely that they didn't!

Equally then, if it doesn't look like that the entire earth was covered by a flood 4000 years ago, it's most likely that it wasn't!

[Enki]

I would suggest the duck test for the great unconformity. If it doesn't look as though a billion years separate two layers, it's most likely that they didn't!

https://ncse.com/blog/2014/11/top-5-creationist-claims-grand-canyon-1-great-unconformity-0015994

https://ncse.com/blog/2015/01/top-5-creationist-claims-grand-canyon-1-great-unconformity-0016078

[Spud]

https://ncse.com/blog/2014/11/top-5-creationist-claims-grand-canyon-1-great-unconformity-0015968

So a piece of rock a centimeter above the dividing line is a billion years younger than a piece from a centimeter below it? And erosion of the surface of the lower layer by wind and rain during this time was prevented how, exactly?

[Sebastian Toe]

So a piece of rock a centimeter above the dividing line is a billion years younger than a piece from a centimeter below it? And erosion of the surface of the lower layer by wind and rain during this time was prevented how, exactly?

.. by the layers above it, which were eroded! D'oh....

[Spud]

.. by the layers above it, which were eroded! D'oh....

Such erosion is not uniform but irregular, and would not have left the underlying surface flat, as we see it is.

[Sebastian Toe]

Such erosion is not uniform but irregular, and would not have left the underlying surface flat, as we see it is.

Not if the pressure from above flattens it.

[jeremyp]

So a piece of rock a centimeter above the dividing line is a billion years younger than a piece from a centimeter below it?

Yep. Isn't nature amazing.

And erosion of the surface of the lower layer by wind and rain during this time was prevented how, exactly?

Because there were layers above it, now missing, that did get eroded.

[jeremyp]

Such erosion is not uniform but irregular, and would not have left the underlying surface flat, as we see it is.

How do you know the interface is flat?  The photograph only shows a very small part of the interface.

[Spud]

Not if the pressure from above flattens it.

Good point.

[Spud]

Yep. Isn't nature amazing.
Because there were layers above it, now missing, that did get eroded.

So is there any evidence for the missing layers that got eroded?

[Spud]

Not if the pressure from above flattens it.

Is there evidence for any now-missing rocks that could have done that?

[Spud]

How do you know the interface is flat?  The photograph only shows a very small part of the interface.

If you're referring to this:
https://www.flickr.com/photos/rwolf/5137667115/in/photostream/
I don't think there is much doubt that the interface is flat.

[Sebastian Toe]

Is there evidence for any now-missing rocks that could have done that?

You only need the now present ones to have done it!

[Spud]

You only need the now present ones to have done it!

The now present rocks were sand when deposited, so that is unlikely.

[Sebastian Toe]

The now present rocks were sand when deposited, so that is unlikely.

You mean that sand can become rock! Wow how long does that take?

[Spud]

You mean that sand can become rock! Wow how long does that take?

Quite a while I guess. Isn't the question "Does pressure from overlying rocks flatten underlying ones?" I think you'll find that this is not the case. For example, do you think the rocks of the Curtis formation flattened the upper surface of the entrada sandstone, seen in this picture?
https://en.m.wikipedia.org/wiki/Entrada_Sandstone#/media/File%3AEntrada_Sandstone_capped_by_Curtis_Formation_in_Cathedral_Valley.jpg
So we still have no evidence for a billion year gap between the precambrian and entrada formations.

[Spud]

Interestingly, the plain on which the entrada sandstone sits in the above picture is also flat

[Sebastian Toe]

Interestingly, the plain on which the entrada sandstone sits in the above picture is also flat

So why are they all flat then?

[Sebastian Toe]

Quite a while I guess.

How long would "quite a while" be, approximately?

[Spud]

So why are they all flat then?

I don't know. I couldn't find out what kind of rock it is on the Cathedral Valley floor.

[Anchorman]

Interesting piece about the decline and fall of the Egyptian empire - in Canaan. http://www.archaeology.org/issues/262-1707/features/5627-jaffa-egypt-canaan-colony

[Anchorman]

      For the science-y geeks, here's a link to DNA research on the ethnicity of Ancient Egyptians. Some of the American 'racial purity' brigade have gone nuts, after assuming purely black origins. On the other hand, the data confirms what the rest of us have known for yonks; despite portraying a xenophobic iconography, diverse populations of migrant settlers from North Africa, the Middle East, Western Asia and even Europe helped stir the gene pool. http://edition.cnn.com/2017/06/22/health/ancient-egypt-mummy-dna-genome-heritage/index.html

[Anchorman]

Orkney: The gift that keeps on giving. https://www.historyscotland.com/articles/scottish-archaeology/new-radiocarbon-dates-shed-light-on-life-in-iron-age-orkney