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In archaeology a posthole is a cut feature used to hold a surface timber or stone. They are usually much deeper than they are wide although truncation may not make this apparent. Although the remains of the timber may survive most postholes are mainly recognizable as circular patches of darker earth when viewed in plan. Archaeologists can use their presence to plot the layout of former structures as the holes may define its corners and sides. Construction using postholes is known as earth fast or post in ground construction.

Posthole cut The cut that formed the hole. It is cut from the ground surface level at time of construction. The sides of the hole may be distorted by later pressure on the post.