Keys to the Past

Glossary

Crop mark; Cropmark; Crop marks

Marks left in crop fields caused by the vegetation growing at different rates; this shows buried features most understandable from the air. These may be where crop has withered, (a parchmark), or where the crop has thrived. They only occur with a combination of factors - and may last long or short periods of time.
A cross-section of a 'positive' and a 'negative' cropmark.

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