Evidence that the Great Unconformity did not Form Before the Strata above it

Oh that are indicated along the edge of the Supergroup. Now I see it.

No such intention.

Going to have to come back to this topic when the whole misunderstanding is clearer.

My understanding (and I just learned this) is that the very geological definition of an unconformity IS the point where there is missing rock.

First of all, I think Edge had an error. I think a sentence above should have been "As to the burial origin of the foliation, if that is due to the Paleozoic section being deposited, then the foliation should be closer to horizontal. The greatest pressure is perpendicular to the foliation.

The metamorphism of the schist require heat and high pressure. The non-metamorphism of the overlying sediments requires the lack of heat and high pressure. The sediments were not there when the schist metamorphism happened.

And that unconformity is a nonconformity - It is sediments on top of basement metamorphics and intrusives.

So some say. I'll have to look it up again but one source who studied the Vishnu says it is made up of a huge range of different rocks.

I ran across this earlier and mentioned it in one of these recent threads, guess I'll have to find it.

Not at all unfortunate. It would solve the puzzle if you were right but everything I've found calls it a metamorphic rock requiring heat and pressure, such as this Google page:

The term 'quartz arenite' is derived from the main component (quartz) and arenite, a Latin term for a rock with sand-sized grains. In some literature, these can be called orthoquartzites, a confusing term which usually refers to the metamorphic rock quartzite, though most metamorphic quartzites are diagentically fused from quartz arenites. The term "quartzose sandstone" can also be used for a quartz arenite.(Quartz arenite - Wikipedia)

Regarding the "Weathering of Ep-Algonkian Surface" (Ep-Algonkian surface is the name used for the surface that would become the Great Unconformity) MacKee summarizes the work of Robert Sharp (1940)quote:
The principal points are as follows:
1. Weathering of the Archean rocks has extended downward 10 to 12 feet in many places and as far as 50 feet below the surface in some places.
2. Weathering of Algonkian rocks has been slight, presumably because they are composed of minerals that have already survived at least one cycle of weathering.
3. Mineralogical changes in the weathered zone of the Archean rocks involve elimination of feldspars, biotite, and other iron-bearing minerals, and a notable development of iron oxides. Another result of weathering is a large increase in the percentage of insoluble residues.
4. Residual enrichment causing an increase in iron oxide is progressive upward toward the erosion surface.
5. Locally a regolith which consists of a foot or two of structureless, extensively weathered detritus grades upward into basal Cambrian sediments and downward into less weathered Archean rock.
6. Boulders of decomposition consisting of cores of relatively unaltered rock, residual after weathering along fractures and joints, are locally present beneath the true regolith.
7. The weathered material of the regolith probably should be classed as intrazonal or azonal soil, but some of the most maturely weathered detritus may be normal soil. A considerable but unknown amount of it probably was removed by waves as the Cambrian sea advanced.
8. At two localities, features interpreted as being due to surficial creep have been noted in the weathered zone at the base of Pre-Cambrian monadnocks. - pg. 121

Each of these points is strong indication that the Great Unconformity was once exposed to the surface prior to Paleozoic sediment deposition.

Keep in mind that the unconformity itself is the solid black line that represents a period where there was not continuous deposition. Also note, that it is interpreted to mean "missing time" but what it actually represents is a time when deposition was not continuous - in other words, deposition paused, with or with out subsequent erosion. (however, erosion is pretty much inevitable at the surface and the presence of an erosional surface would be an indication that an unconformity exists). So there is actually no "missing time" but simple no deposition.

Also note that there is nothing in that definition that defines long periods of time. Deposition could have paused for 1 minute between flood waves or 1 million years during an uplift.

To determine time frames we would need to look at processes. But I suggest that we just focus on determining IF the Great Unconformity is really an unconformity or is it something else.

Would it not be more accurate to say that "the Great Unconformity represents at least a billion years of missing record?"

We can say that the time period would be at least as long as shown by the remaining layers of the Super Group but what is left of the Super Group is very likely not all that was there.

ABE: You can bring up all kinds of exceptions, as I already acknowledged, ...

... but the problem is still how to explain the vast majority that exhibit such a flat horizontal contact -- and even the exceptions are MOSTLY flat and horizontal.

I said no such thing. I said lumpy bumpy spiky or inclined surfaces would not erode flat.

That's changing the subject. FIRST ACKNOWLEDGE THE POINT, THAT EROSION CAN'T DO IT.

It first needs to be acknowledged that erosion couldn't accomplish what you all claim it did with the Great Unconformity.

But at this point I'm not defending my own interpretation, I'm insisting that the absurdity of the conventional interpretation be recognized.

Look at the pictures for a definition of "flat."

But you haven't. You've shown flat surfaces but without any evidence that they are the sort I've been talking about.

THERE IS NO EVIDENCE OF IT IN THE ROCK RECORD. THERE ARE LUMPY ROCKS WITH FLAT SURFACES. THERE IS NO EVIDENCE OF HOW THEY GOT THAT WAY.

If you had bothered to read what I wrote you'd know that I was talking about the impossibility of eroding down to flatness tilted surfaces like the angular strata of an angular unconformity and lumpy surfaces like schist and granite, ...

and specifically said I was NOT talking about naturally FLAT surfaces like the Kaibab which is the upper surface of a limestone layer. I SAID THAT IN SO MANY WORDS. Sheesh.