Just an update and a few thoughts:
I've seen enough shows on making crop circles to know all you need to make a perfect circle is a stick in the center and a rope extending out to the radius, attach something sharp to it and walk around and you surely could make the illusion that a perfect circle was there.
Then pound a rod in the ground to form a deep hole, mark it with a near by stone or rock and show someone how you can submerce a long stick into the ground at a spot or two which you setup to appear as random.
But back to Google Earth, etc.. Type 08733 (our zipcode there) look the neat stuff including the giant moon shaped ( and I mean just like the moon ) "Jump Circle". When looking around you'll see a series of 4 mile long tracks where JET ENGINES hurdle down long railroad tracks to be tested, a smaller "T shaped" landing strip and a hugely long runway which is an alternate Space Shuttle Landing Site.
Another thing, you see a series of BLACK seni-trapizoidal ponds, they were a very large Cranberry Bog, supplier to Ocean Spray. Checkout the TOWN of LAKEHURST in comparison to the other objects - Lakehurst is Triangular (kinda, with a nice lake) and 1 square mile worth of square feet.
Just a show around my area. Go to the South and East a little and you'll see a very long emerald green looking lake, that was known as Asarco Mining where they removed minerals from the water, leaving it that funky color - I'm located in a small housing development about the Eastern side of the Asarco Lake just south of Route 37, near the railroad tracks. Very wooded, small neighborhood, nice homes and great neighbors and only 6 miles from work :)
P.S. Mick, I don't know.... Some capped over silo, covered decades by wonderful topsoil, methane is a very big product around here and that area isn't to far from what was the Lakehurst Dump a few decades back - not to forget up until WW2, Lakehurst also had a mortar and bombing history - I have told the story, very true story of my father digging up a live 75mm mortar shell under our propane tank (of all places) when we built our back porch on to the property - that clean-fill had been made available long ago and someone grabbed up a truckload and buried it around our house, maybe to buildup topsoil, who knows our old house was over 160 varified years old.