The ditch section of the Overton Down Experimental Earthwork provides a dated record of the degradation of two free faces with opposing aspects of a ditch dug into the chalk in Wiltshire. The earthwork was constructed in 1960.
Its gradual decay has been closely observed since - tests and excavations have shown that it decayed quickly over a number of years but then stabilised, suggesting that many prehistoric earthworks may have reached something not unlike their present state quite soon after they were abandoned.
A full report is available at http://archaeologydataservice.ac.uk/archives/view/cba_rr/rr100.cfm
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