...not neat and flat but hard and lumpy. Then more hard and lumpy and unsorted variegated stuff would be above it, and in fact impossible to differentiate from it. You aren't going to get neat layers of clearly different sediments.
At the risk of pointing out the tragically obvious, you have just described how the ongoing accumulation of "hard and lumpy and unsorted variegated stuff" becomes an undifferentiated layer after lithification.
A layer . Not many layers. Those other neat layers come later.
Note that those lumpy, variegated surfaces and the things that live on them are colloquially known as "landscapes". You should let the little compartments in your head talk to one another. Also try to imagine the actual nature of the reality that your words purport to represent.
The next "neat" layer(s) may not form for eons, and the layer we have chosen to focus on may well have been smoothed by other forces before being covered by them, or subsequent activity on the surface can remove the layers that did the original compression and plane the area smooth prior to yet another round of sedimentation or whatever. Have you seen how thoroughly ice sheets can plane away topography? The mountains up where we go boating are littered with hanging valleys in which the stone has been planed smooth by glaciers. As they silt in from erosion and vegetation, the next layers to be lithified will be sitting on glass smooth stone. Neat smooth layers of stone on stone in valleys where grizzlies now roam.
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