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In page Archaeological excavation:

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"Strip, map and sample" is a method of excavation applied in the United Kingdom to preserve archaeological remains by record in the face of development threats. It involves machine stripping an area, plotting observed features onto a site plan, and then partially excavating those features (sampling).[citation needed] The approach is undertaken when a site is to be destroyed by development and no satisfactory method of preserving archaeological remains in situ can be devised or adequate funding and time have not been factored into development project planning to allow for a full archaeological investigation.[citation needed]