For over thirty years, work has been in progress on the petrological examination and identification of stone implements. This work, initiated in South-Western England, has as its object the determination of ‘early trade routes and other factors of economic and social importance in Neolithic and Early Bronze Age times’ (Keiller, Piggott and Wallis, 1941). During this period, eight regional reports have been published, five dealing mainly with South- Western England (Keiller, Piggott and Wallis, 1941; Stone and Wallis, 1947; Stone and Wallis, 1951 ; Evens, Grinsell, Piggott and Wallis, 1962; Evens, Smith and Wallis, 1972), one with Yorkshire (Keen and Radley, 1971), one with East Anglia (Clough and Green, 1972) and one with Nottinghamshire and Lincolnshire (Cummins and Moore, 1973). In these and other publications (e.g. Fox, 1964; Fell, 1964) distribution maps are given for the products of the various axe factories. Such maps show the extent of dispersal of the factory products, but fail, in themselves, to give much information about trade routes and other factors. Group I axes are found in Yorkshire, some 550 km. from their source in Cornwall; Group IX axes are found a similar distance from their factories in Northern Ireland; and Group VI axes are widespread up to 500 km. from their Lake District factory sites.