Welcome to Postcard Friendship Friday, hosted by Marie at the French Fractrice.
This is an oversized postcard (6 by 8 inches) published by the New Mexico Bureau of Mines and Mineral Resources, 801 Leroy Place, Socorro, NM. I have scanned it at a higher resolution than usual so there should be detail visible if you double-click on the image.
The back has a good summation of the general geologic history and so I will quote it here, with my comments in [ and ] brackets.
"The rocks of New Mexico reveal a long and complex of deposition, volcanic eruptions, structural deformation [due to plate tectonics as described in earlier posts], and climatic extremes -- from intensely folded Precambrian cores of mountain ranges more than 600 million years old to black basalts that flowed across the landscape as recently as 900 AD. White sand dunes today move slowly across the world's largest gypsum [a calcium sulfate mineral] desert, where waves of water once broke upon the shores of vanished lakes. New Mexico's extensive mineral and energy resources are a result of this colorful history -- petroleum and natural gas, coal, copper, uranium, gold, silver, molydenum [used for specialty steel] , lead, zinc, barite [a source of barium], fluorite [mined for fluorine, used in industry], gypsum [mined for drywall, aka sheetrock], perlite [see Wikipedia entry] , potash [used in fertilizer], and sand and gravel."
A Virtual Geologic Tour of New Mexico from the Bureau.
Major cities shown on the map are Farmington, Santa Fe (the capital), Albuquerque, Socorro, Las Cruces, and of course, Roswell.