[BR-Crater] photos and more analysis from Upper High Dry

[Ian Kluft]

Here are the photos from Sunday's visit to Upper High Dry lakebed:
   http://ian.kluft.com/blackrock/upperhidry-20070805/

I delivered the rocks from Upper High Dry to Brad for him to look at.
He's encouraged about the kinds of rocks we're finding there, particularly
since it's so easy to find breccias and melt rocks, which should be the
case in an impact site.

As we talked about them, we referred back to the "Traces of Catastrophe"
text again.  Referring to a diagram showing the structure of a typical
impact crater, what we've found is probably "fractured basement rocks".
If so, shocked rocks would be located above them.  So next time we return
to Upper High Dry, we need to check higher up in the rocks where we were
on the north side to search for shatter cones.

"Higher up" is available - we only went 1/3 of the way up the slope.  
But it becomes steeper until it's a sheer cliff at the top.  A nearby 
4x4 trail (which was explored on the Stratofox 2 trip in August 2003) 
probably goes up through those layers at a more gentle slope.  Both 
places should be options to look for shatter cones.  I wouldn't go to 
either without a larger group and more vehicles.

Photos from Stratofox 2 of the 4x4 trail we'll want to explore again:
   http://ian.kluft.com/blackrock/sf2-200308/sat-br-range.html
   http://www.chaosring.org/~seanl/photos/Stratofox%202/img058.jpeg.html
   http://www.chaosring.org/~seanl/photos/Stratofox%202/img059.jpeg.html
   http://www.linwin.com/stratofox/2003-08-22/tn/sfox-20030822-36.jpg.html
   http://www.linwin.com/stratofox/2003-08-22/tn/sfox-20030822-37.jpg.html
   http://www.linwin.com/stratofox/2003-08-22/tn/sfox-20030822-38.jpg.html
   http://www.linwin.com/stratofox/2003-08-22/tn/sfox-20030822-39.jpg.html