Lithic terminology and typology

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metric variables of British PDTs

The metric variables of British PTDs (chisel-shaped and oblique arrowheads) (Ballin forthcoming).

When excavating prehistoric sites, it is common to retrieve large numbers of lithic artefacts. To place these finds in their temporal, spatial and culture-historical contexts, and to allow comparison with other assemblages, it is necessary to classify and describe the material accurately. The main precondition for comparative archaeology is a general consensus on key concepts, that is, a common archaeological language.

Clark's 10 main PTD forms. Types E and F have been  rotated to bring their orientation into line with present consensus  on their likely hafting form. Re-drawn from Clark (1934).  Metrically defined debitage categories.
Clark’s 10 main PTD forms. Types E and F have been
rotated to bring their orientation into line with present
consensus on their likely hafting form.
Re-drawn from Clark (1934).
Metrically defined debitage categories