NORTH DAKOTA: Slope Co; S of Burning Coal Vein Campground - June 2023
NEW MEXICO: Hidalgo Co; on NM 9, east of Animas - September 2016
NEW MEXICO: Luna Co; on NM 9, west of Columbus - September 2016
NEW MEXICO: Torrance Co; NW of Corona - May 2014
TEXAS: Moore Co - August 2008
TEXAS: Presidio Co; near Valentine - May 2007
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TEXAS: Andrews Co; November 2003 (scan from slide)
TEXAS: Sterling Co; near Sterling City - June 2003 (scan from slide)