No amount of compaction would change "all the normal surface conditions" of any surface on the earth now or ever into straight flat rock. Hills, valleys, riverbeds, lake basins, deep tree roots, no.
Not compaction alone, no. You need sedimentation first. But even then, the layers aren't so flat until after they are compacted.
You can't look at the flatness of the layers and think that when those layers were on the surface they were also as flat.
Same answer to your Message 266 where you say compression would have made the strata appear flatter.
I didn't mean that a mountain gets compacted. You got to have erosion and sedimentation, then later you get compaction.
All three of those processes increase flatness, so the flatness doesn't show what the layer looked like when it was on the surface before those processes.
Not unless the compressing weight was flat itself,
Actually no, it depends on how flat the layer underneath that it's being compressed into, not the one above it adding to the compression.
And when the compressive pressure approaches infinity, the flatness approaches perfection. The further down you go the flatter the layers will be.
But not if the sediment being compressed had any of the lumpiness of a normal surface of the earth.
That literally has nothing to do with it.