Continuing erosion of the axe production sites prompted a field survey which identified and recorded 566 distinct working sites within 35 groups. A fourfold categorization has been developed. Production was on a massive scale and appears to have developed towards greater sophistication and organization. Estimates of relative flake quantities for each group of sites allowed comparison of varying levels of activity at each group, and differing strategies at the two main production sites were also examined. Petrographic studies of outcrops and debitage suggest the possibility of attributing dispersed products to specific production areas.