The distribution of lithic implements in the Arabian Gulf suggests two regions, each using a specific set of tools. It is argued here that this distinct pattern is the result of relations on various levels between several human population groups and not solely of ecological adaptions. Consequently, these contacts between indigenous groups might be held responsible, among others, for distributing goods, like 'Ubaid pottery, initially brought along by Mesopotamian visitors from the Central Gulf down to the Lower Gulf.
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