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 a stone run 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.