Compare with the petroglyphs and geoglyphs discussed in Dr. Anthony Peratt's 2003 paper, Characteristics for the Occurrence of a High-Current, Z-Pinch Aurora as

Compare with the petroglyphs and geoglyphs discussed in Dr. Anthony Peratt's 2003 paper, Characteristics for the Occurrence of a High-Current, Z-Pinch Aurora as Recorded in Antiquity: http://plasmauniverse.info/downloadsCosmo/PerattTPSv31-2003clr.pdf http://plasmauniverse.info/downloadsCosmo/PerattTPSv31-2003c... The timeframe (8,000 years old) mentioned in the article generally fits with the timeframes given in Peratt's paper. So perhaps these earthworks are further evidence of ancient peoples recording (in some sense) a stupendous "light show" that defied explanation and ordinary human experience. Additional publications on the same theory, by Peratt and other researchers: http://plasmauniverse.info/NearEarth.html http://plasmauniverse.info/NearEarth.html