GREAT picture!!! Those are exactly the kinds of mountains/mesas I want on my layout. I'm familiar with them after dozens of road trips between DFW & SLC, visiting family. The Bookcliff mountains running along the north side of I-70 from CO to US191N look a lot like that too, though maybe not as reddish (they face south, baked by the sun all day long, so the colors are more muted). The cliffs opposite Arches NP along 191 north of Moab are more red like yours appear. The landscape along US 191 between Moab and I-70 also shows a lot of copper oxide (green) color too. I'm planning on stacking layers of half-inch extruded foam insulation board for the N scale terrain (scaled by WS incline starters for the track), and the broken edges will make for the rock strata in similar scenes on my layout (not near scale though). I think I can use a woodworking marking gauge to scribe additional strata boundaries in the edges of the foam board. Of coarse the vertical scale will be severely compressed on my HCD layout, but I've also noticed the same physical look on much lower "mesas" in other parts of the country, scaled to height. Your picture also captures the earth and rock debris accumulated at the foot of the cliffs. It seems like the debris typically accumulates to from a quarter to a half of the height of the cliff (unless a water source was there to keep more of it swept away). The color saturation varies a lot with cloud cover, time of day, and especially whether it is raining/snowing (or just stopped). The drive north into Moab is prettier than the same highway headed south out of Moab. Just the angle of the views... I think you just about nailed the practice piece. One thing I have noticed is that the strata are very level (it was a shallow seafloor originally, so the layers were evenly deposited), so the boundaries between layers don't slope much, but from a given point of view they might appear to in a photograph. In some areas, subsequent geologic folding can create slopes in the layers, but I have not noticed it in that area of the country. Big Bend NP? Yep, there's been some major geologic folding there. And of course the Rockies. The RM terrain was created by geologic up-thrusts, folding, etc., not erosion of an ancient, dry and stable seabed as in southern Utah.