In archaeology, if the kick plates on the shovel are facing the back, dirt commonly gets compressed within the kick plates along with some grass and other weeds. As these clumps of dirt dry out, they tend to fall into the shovel bum's screen. These often look like crude, most likely Early Woodland rim sherds and have been known to fool an archaeologist until he or she looks closely at it. Sometimes, these are intentionally created with the hopes of fooling the supervisor.

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