Cropmarks are a type of archaeological evidence, by which sub-surface archaeological, natural and recent features may be visible from the air. They can reveal buried archaeological sites not visible from the ground.

Different heights of crop growth result from a wall and ditch below the ground

Crops in a field can grow differently depending on what lies below them. Water will naturally collect in a ditch buried underneath crops. This will encourage the crops above it to grow tall and strong. On the other hand, a wall underneath the surface will dry out the soil and lead to shorter crop growth immediately above it.

These different rates of growth will naturally follow any features buried below ground. Although the differences in growth may appear small close up, from the air these are more visible. When the sun is low to the horizon, shadows cast by the taller crops can also become visible.

Leave a Comment

Comments posted using the form below will be published on the website. It is therefore recommended that you do not include any personal details or contact information in the comment.

If you have a question and want to provide personal details we recommend you use the 'Contact Us' form instead.

Your email address will not be published but it may be used to contact you with a reply to your comment. Required fields are marked *

  • How time flies! These photos are from 1992-1993 when we were based at County Hall, Kingston, & Guildford Muniment R…