The strata in some cases cover thousands of square miles of unbroken flatness, between others of similar flatness. The Tapeats covers most of North America, so does the Redwall Limestone. Reqally, this is not how the surface3 of the earth is built up.
It's how the bottom of the sea is built up, Faith. Those are both marine deposits. Hence their sedimentology and fossils.
And marine deposits do cover vast areas. Look at those huge continent-sized areas of marine sediment:
Now consider how much bigger still they could be if the sea level was higher and America was partly submerged, as it was.
You see how in real geology everything fits nicely together and no-one invokes magic?