Summations Only

I suggest you mention that a meter is about a yard (close enough for here). That is a pretty esoteric fact for some of the less well informed.

Actually I don't know a heck of a lot about the strata of the GC either but... does that stop me? For there to be a large area of flat, undisturbed layers you'd need something depositing sediment there for a long time. What could possibly do that? Magic?Oh, how about an ocean? The layers would vary with the surrounding conditions and do oceans last 100's of millions of years? Well, it seems they do.How long should we expect a given continental area to remain "undisturbed" (discussed more below)? We'll from my limited knowledge major orogenies are caused by tectonic plate movements (not isolated volcanoes). Someone is lumping them all together because they don't understand any of it. How frequently should we expect them? once in 10 million years, a 100? , a billion? They result when the supercontinents form and breakup. The Appalachians are a worn down stub of the orogeny when pangea formed (IIRC). That sat there for a looong time. Then the Atlantic started to open and North America started to plow up the Rockies. Since the continents take 100's of millions of years to crash together, sit around and then start to split up we would expect 100's of millions of years between orogenies.Why anyone would expect other wise I can't guess. (and they aren't telling)Volcanoes are, of course, associated with tectonics but don't have to be over much of an area and can arise and fade awary in millions to 10's of millions of years so they can operate on time scales about an order of magnitude smaller than major orogenies.That's my thinking anyway. So no, on a large scale we shouldn't be surprised at what we see. Of course, half of what is being said isn't true anyway.

Do you think you have the same structure yellow boxed in those two pictures? 'Cause I am as sure as I ever am that you don't.
The upper left corner of the left picture yellow box is displaced about a little finger width fomr the lower right corner of the yellow box in the right image.

Now that you've been give the explanation twice did you not feel the need for a forehead palm?I find it more fun when I think of the explanation behind something myself. When I can't then I ask the question. If the answer should have been obvious, like this one, then I try harder next time. And feel just a tad sheepish.