[ElectricStrawberry]

What was the rest of the river bed doing while this cut was made through this very selectively uplifted hard material?

BWAAAAAhahahahahaha....the rest of WHAT river bed? The river was already there, PRE-uplift...the basalt formation uplifted perpendicular to the river...very slowly. The river eroded the basalt formation as it rises up beneath the river...over a long period of time. Take a look at Pennsylvania and all the water gaps there.

Too difficult? Rhetorical question...the concept doesn't include Man walking with meat eating dinosaurs.....or pre-Fall vegetarian T rex

I know...I'm supposedly a liberal.

[editor-surveyor]

I know that you’re not intelligent enough to realize that your first two sentences acknowledge my point! (amazing)