Questions about noah ark

[Gawdzilla Sama]

That's not a mountainside, it's a cut for a highway. Just plain old Missouri hills just like those in the near ground and far distance. The Ozark Mountains are mostly limestone, IIRC.

Please correct me if I'm wrong. when you say the mountains and hills are made of limestone, does that mean the flat lands aren't? Could it be that when the continent was undersea, the moving water caused the loose fossils to pile up, thus forming hills and mountains the same way sand piles up to form sand dunes?

The limestone beds spread out over much of US, remains of the great Cambrian Era oceans. The glaciers shaved down the hills north of the Ozarks, running  up into Indian and on into Pennsylvania. (I-44 is on the northern edge of the Ozarks.) 

Look at the layers in that picture. They're created when the critters die and fall to the bottom. They're generally flat, or were flat until a geological event tilted them.