Showing posts with label Arizona geology. Show all posts
Showing posts with label Arizona geology. Show all posts

Wednesday, March 12, 2014

Where on Earth?

Where on Earth (WOE) are we?
Open with care.

I hate flying.  It’s a stress scene.  As always, I couldn't take everything I wanted to.  My e-passes didn’t arrive, snow was forecast, I had to be at the airport at 5:15 am, etc.  Security’s always a puzzle (infrequent flier) so I imitate the people in line ahead.  It went well until TSA discovered a Swiss Army knife in my pack.  (I forgot, really!)  Stuff spilled all over when they inspected the pack, it was crammed so full.  I could barely lift my carry-on bag into the overhead compartment.

The plane was packed full.  No one smiled, few chatted. Somebody coughed and sneezed regularly.  A baby wailed behind me.  We waited, then waited, taxied a little and waited again -- for de-icing.  Finally we took off.  It was getting light and through the clouds were glimpses of mountains, frozen lakes, broad white meadows, high snowy peaks with tree-lines far below and glacial cirques.  It was beautiful.  I relaxed, even dozed off.  When I awoke, the clouds were gone.

But where on Earth were we?  It was a harsh country -- brown, yellow-brown, reddish-brown, ochre, burnt-ochre -- with almost no vegetation to obscure the landscape.  The landforms were clear and striking.  [Click on images to view.]

WOE? #1:   Entrenched drainages in foreground and distance, “confined to a canyon or gorge ... with little or no flood plain ... often with meanders.”  The CLUE is a prominent landform.
WOE? #2  Sandstone monuments and mesas in center of photo.
WOE? #3  Another entrenched drainage.
WOE? #4  Linear structure extending from lower right to center top includes (left to right): steep sandstone hogback dipping to left, reddish strike valley with dry drainage and highway, more gentle hogback.
WOE? #5  Entrenched meanders and prominent gooseneck -- "an extremely bowed meander."
WOE? #6  Leaving the desolate country to cross a high forested plateau.
Where on Earth were we? ... over the Colorado Plateau, where all these landforms are common.  I’ve spent a lot of time among them on the ground, and it was really cool to see to see them from the air.  I love flying!
One of the many wonderlands of the western USA; source.
Above:  Where on Google Earth, coordinates below.  Note: photos in post are “upside down” as I was shooting roughly south.

#1  611873.00 m E  4119824.00 m N; this is the location of the CLUE, an abandoned meander of the San Jan River
#2  580157.12 m E  4101810.81 m N (approximate); looking toward Monument Valley
#3  488244.77 m E  4064986.78 m N; one of many entrenched drainages on the Plateau
#4  448807.42 m E  4038890.32 m N; this strike valley is traversed by US Hwy 89
#5  422814.73 m E  4027471.85 m N; Colorado River not far upstream from Grand Canyon
#6  408229.18 m E  4022493.52 m N (approximate); starting across the Kaibab Plateau