I spotted these strange patterns on Google satellite imagery & had to see what they were in person.  From ground level they don't stand out but flying 150 feet in the air they are quite fascinating.  They are located in a remote area near Six Shooter Pass, California & consist of a barren meadow slightly higher than the surrounding juniper plains.  The lava rock lines are void of plants & seem to have a manmade patterning even from ground level, however I suspect they are natural in formation, almost periglacial like patterned polygons except this is drier desert country.  The entire meadow is the same elevation though the larger circles consist of slightly higher gradual mounds a few feet high.  The patternings end at the edge of the junipers.  There are a few other meadows with these exact formations trending northeast.