The files contained in this subdirectory are map image files as registered geotiff (*.tif) images with associated world files (*.tfw). The prefix clr indicates that the image is a flat color image of the indicated data set (mag_rtp; reduced to the pole magnetics and res_frequency are resistivity images). Geology_flt_lines are images of the flight lines superimposed on the geology (Smith and others, 2003). The projection for all files is 
Datum:	NAD27 
Ellipsoid:	Clarke 1866
Projection:	UTM (Zone: 14N)
Central Meridian:	99º West
False Northing:	0
False Easting:	500000
Scale Factor:	0.9996