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      5 Rarity

    Approximately 52 fairly certain causewayed enclosures are known to
    date in England, together with perhaps a further 20 possible sites.
    This number is likely to be an underestimate of what remains to be
    discovered, because most of these have been recorded in the last 30
    years; in 1954, for example, Stuart Piggott was able to list only 13
    sites. Most of the recent new discoveries have come about in one of
    three main ways: aerial photography; the discovery of Neolithic
    enclosures under later sites, especially hillforts; the
    reinterpretation of earthworks claimed as later monuments.

    Causewayed enclosures are not always easy to locate by aerial
    photography as they often only reveal themselves under ideal
    circumstances, and rarely show their full plan at any one time. Work
    in East Anglia has emphasized the point that some of the best
    preserved examples lie beneath alluvium or peat cover and are
    therefore especially hard to locate except in extreme drought
    conditions.