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.
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