plano-convex knife
[Ar].
Type of later Neolithic and early Bronze Age flint tool found in the British Isles, particularly associated with burials in northeastern England. Plano-convex knives have a leaf-shaped outline and slightly elongated form, worked on large thick flakes with retouch around and sometimes all over the convex dorsal surface but a plain untouched ventral surface. Also known as a slug-knife.
Plano Cultures
[CP].
Late Palaeo-Indian hunter-gatherer communities representing many different cultures found widely over the Great Plains of North America in the period 9000–6000 bc. Characterized by unfluted leaf-shaped projectile points which are generally known as
PLANO POINTS
. In general, these various communities were bison hunters, although they also took pronghorn antelope, elk, deer, raccoon, and coyote. By the beginning of the Archaic Stage, however, Plano groups were developing a more broad-spectrum approach to subsistence.
Plano points
[Ar].
General term covering all the unfluted styles of bifacially worked chipped stone projectile points from the Great Plains area of North America in the period 9000–6000 bc. These Palaeo-Indian points have been subdivided into numerous styles on the basis of size, shape, and other attributes and include, for example, Alberta, Cody, Fredrick, Eden, and Scottsbluff points.
planted town
[Ge].
An urban settlement that was deliberately constructed to a preconceived plan. In some cases, for example Salisbury in England, started in ad 1219, they were established on a totally new site. In other cases they substantially enlarge an existing settlement. Some planted towns had a regular form with chequerboard, ladder pattern, or concentric street grids that determined their morphology; others were more irregular and were often built around a central open area or market-place.
plant impression
[De].
The negative cast left by some part of a plant when it was deliberately or accidentally pressed into a plastic substance such as clay or plaster that has survived to be excavated.