Abstract
Analyses have been directed towards providing an objective basis for the untested assumption that interrupted ditch enclosures, discovered in riverine situations by aerial reconnaissance, are related to the high-lying neolithic causewayed enclosures. The results of a series of attribute analyses appear to justify the unity of the enclosures, while at the same time suggesting a division into four geographical groups. Aerial photography has been used to provide data for comparative studies. In this case, sites known only from the air have been compared with excavated enclosures which show similar characteristics. The resulting classification is thought to demonstrate the feasibility of such an application of aerial photographs.

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