Mother earth is going to reveal more secrets.
No circles, but surfactants have definitely been dumped. Probably not even drugs. Just a factory that didn't want to pay for proper disposal.
Damn. That's a really good explanation. I think you're right.
Could be foundations of an older civilization. You see Bronze/Iron Age stuff like this pop up all the time in Britain.
Looks like raised earth with irrigation.
My wager, someone is farming on swampland.
If you have ever tried planting in swampy areas, you know you have to build up or your plants will drown.
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