[fishtank]

Figure 1. Gypsum Mountain, north-west Wind River Mountains, Wyoming, USA. The strata dip to the west at about 40°, but they have been planed flat.

Article figure and caption.

[grobdriver]

Martian landing fields, obviously.

[dirtboy]

No mystery about it. The current Rockies (yes, there were ancestral ones) were uplifted 70 million years ago or so in the Laramide Orogeny. They were then eroded until they were a level plain with a few peaks poking up. Then the entire region was uplifted again, probably from the Yellowstone and Raton hot spots migrating underneath the region, and the eroded debris was transported away, leaving the eroded surface elevated. The best example of what this used to look like is the Gangplank in SE Wyoming, where the original erosional surface is still continuous to the top of the Laramie Mountains, a very convenient situation for the Union Pacific.

I've been to both the peneplains of the Wind River Range at 12,000 feet and the Gangplank.

[fishtank]

http://www.icr.org/article/8801

Remembering Mount St. Helens 35 Years Later

by Brian Thomas, M.S. *

Evidence for Creation › Evidence from Science › Evidence from the Earth Sciences › The Global Flood Is the Key to the Past

The volcano’s main 1980 eruption filled in an entire valley with hundreds of feet of sediment. Another smaller eruption event deposited more material on top of that, and then a third deposition occurred in 1982. Later, a catastrophic flood of snowmelt water and muddy debris tore a gash through those fresh deposits, revealing sharp and flat contacts between each earlier deposit. It also showed that fast-flowing currents can lay down multiple layers thinner than a finger width.....