Crop marks?

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thelonious T
thelonious Jul 9, 2018 18:35:50
Replying to Monganaut

Thanks for your reply Monganaut. 'Drip gully' - I've learnt something new today (I had to google it). I like the idea of water dripping off a roof to form something that can be found long after the building is gone. Like finding the consequence of the action.

M Monganaut
Monganaut Jul 9, 2018 20:26:32
Replying to thelonious

I'm sure you're aware of the 'science' behind crop marks, but if not it's pretty simple. Walls or other impervious structures stunt plant growth, leaving a 'parch mark' above, say a wall. The greener crop marks are generally down to holes or ditches being dug, and later back filled or filling up with looser or 'humic' plant material material, which I guess is what you saw with your crop mark. The break in the crop mark ring is intriguing, and does seem to 'address' those hills in the distance, though without knowing the direction of the entrance, I wouldn't like to say.
Anyhoo, some good examples of crop marks turning up....
https://rcahmw.gov.uk/cropmarks-2018/