The Lance/Hell Creek As a Flood Deposit

At Jar's request, I'd like to propose a thread that discusses the Upper Cretaceous Lance Formation in the western United States (mostly Wyoming, but also Montana and Colorado) within the context of The Flood. By that I mean to ask if someone can explain the geology we see in the Lance as a flood deposit. The Lance is often held up as the classic example of a meandering river deposit. This suite of rocks is characterized by lenticular, discontinuous sand bodies interbedded with mudrocks. There are also a good number of lignites/coals within the unit. Plants aren't common, but they exist. Dinosaurs are quite common (preserving a snapshot of the last days of the dinosaurian reign, this is the stomping ground of Tyrannosaurus, Triceratops, Ankylosaurus, and the like) as are freshwater crocs, turtles, birds, rays, etc. Could someone offer an explanation for this unit as a the result of a single global flood event. Since they're essentially the same package of rocks, we'll include the Hell Creek Formation herein as well.

Thread copied to the The Lance/Hell Creek As a Flood Deposit thread in the Geology and the Great Flood forum, this copy of the thread has been closed.