Crop marks?

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Monganaut M
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/

C CR
CR Jul 10, 2018 07:07:35
Replying to Monganaut

Agreed - many possible variables in surface appearance of crop-marks, but looks like a fair candidate for negative (ie dug) feature.

Having excavated many round houses and enclosures, the term 'drip-gully' is a bit misleading. Most roundhouses have a dug out gully/ditch,rather than one formed by water. These function as boundary markers, being re-cut/maintained, and with special attention to entrances, as well as a function to potentially controlling surface water around the structure during heavy rain.