An Even Narrower and Deeper Valley Is Now Seen. Canyon Walls Are Steep In This Upstream View Looking South And A Bit West.
….And If You Look Just Below The Snowy Peaks, You Can Discern The “U”-Shaped Glacial Valley Form.

…. [ZMM passage repeat] [ “The sun is bright and hot when we’re in it, but when we pass under trees along the road, it’s suddenly cold.” ]

Entering Rock Creek Canyon, by a shade tree, Beartooth Highway, MT. “U”-shaped valleys are caused by the grinding action of the valley filled with Glacier Ice, as it slides further down the valley. The Glacier Ice incorporates many rocks which do the actual grinding, and this greatly speeds up the cutting action.
….Compared to a Glacial Valley, If a narrow valley is geologically “new” and is primarily carved out by water of a stream, it is generally “V”-shaped.
.…And by contrast with the above => If the valley is very, very old, it generally will be quite wide and relatively flat, like we have seen in the previous photos of the Yellowstone River Valley.
….By happenstance, the /\ Above /\ Photo location is the only place where I recall finding “over the highway shade”. This is why I stopped here to cool off.
…. Here, this shade tree was behind me, but at this time of day, the shade had not reached the highway. Only later in the day would it cover the highway.
….Properly done, you should actually see a photo of this shade. However, this is one of several places where I thought I had taken a photo, but it was not in the camera when I got back. What happened?
….At certain WayPt’s along the travel route, more than one photo is needed to properly show the scenery. => Generally I have a choice: a) 360 degree panorama. b) Two or three side by side. or c) One forward + one rear.
…. At this location a second photo to the rear, really NorthNorthwest, is shown NEXT Photo.

*************************
(Photo = 106-0606 ...... ZMM Page = 105 ...... WayPt = 130w)