The Mousterian and related flake industries followed the Acheulean. A refinement of the prepared-core technique, termed Levallois, was developed during the middle to upper Acheulean. In this method, a core was craftily trimmed in such a manner that a skillfully applied last blow would detach a large preshaped flake directly usable as an implement; the core was discarded. Such a flake tool, with one flat surface, is known as a unifacial tool because a single bevel forms the working edge. There are two principal kinds of flakes, points and scrapers. The former are roughly triangular, with two trimmed or sharp edges meeting in a point, the base or butt of the triangle being thick and blunt. The side scrapers have a sharp edge in the long direction of the flake, with an opposite, thicker butt section. The scraper could function as a knife, although it is speculated that it was used for working wood and skins, a supposition leading to the idea that skins were being used for clothing.

Late Paleolithic toolmaking

The fourth phase of Paleolithic toolmaking was introduced perhaps 40,000 years ago by the Aurignacian industry, a forerunner of the last and most brilliant achievements of the Old Stone Age. Extraordinary inventiveness was characteristic of the Aurignacian tradition and its several short-term successors. They can be lumped into a unit of development that spans the next 25,000 years.

Fully modern humans—whose first representative is the Cro-Magnon—emerged within this period, perhaps 35,000 years ago, during the time of the development and elaboration of rock technology, which, by providing a variety of specialized tools, mostly of the flake and blade types, at last brought materials other than rock into extensive use. It was also a time when the great plains in northern and eastern Europe carried such a heavy reindeer population, in addition to wild horses and mammoths, that it has been called the Reindeer Age. This produced a hunting economy providing food and great quantities of bone, horn, skin, sinews, and, while the mammoth lasted, ivory; with it grew new technologies exploiting the unique properties of materials hitherto unworkable because of their hardness. This technological diversification was made possible by new techniques and rock tools, whose specialization and complexity fit them to the fresh tasks. The most significant tool was the burin, or graver, a stout, narrow-bladed flint able to scrape narrow grooves in bone; two parallel grooves, for example, would allow a sliver of bone to be detached as stock for a needle, pin, awl, or other small object. Larger pieces of bone were worked into hooks with one or more barbs or points. Sections of antler were carved into splitting wedges to work out long pieces of bone to form the dartlike projectiles of the spear-thrower. Sandrock polishers were added to the tool kit to sharpen and shape tips, needles, and other articles.

A spectacular item that developed by the end of the Paleolithic was the spear-thrower, a hand-held stick, of wood or antler, notched at one end. Functioning as an extension of the arm, it added considerable kinetic energy, and therefore range, to a short spear tipped with flint or bone. The tipped projectile represented still another innovation, for it was the first hafted implement.

Hafting, or the fitting of a handle to a cutting edge, was a momentous and far-reaching invention of about 35,000 years ago. It was a critical step toward the creation of new tools and improved models of old ones. In its simplest form, the haft may have been no more than a grass or leaf bundle whose limited function was to protect the hand when a fractured rock was used as a knife. Mechanically, the handle became a force-transmitting intermediary between the source of the force and the toolhead. An extension of the arms, the handle provided an increased radius of swing. This moved the toolhead faster to give it more kinetic energy for a harder and more telling blow than the arms alone could provide. A man using a hand-held axhead could cut only small trees, whereas with a hafted ax he could fell a tree of almost any size.

More From Britannica

origins of agriculture: Hand tools

The prepared-core technique that provided preshaped flakes was refined and extended to provide preshaped blades, long, slender pieces of flint of trapezoidal cross section, each corner having a straight cutting edge without the serrations of a chipped tool. This is known as the blade tool industry, a final complement to the core and flake tool technologies. Such blades made thin and splendid knives of great variety; many of these knives were backed; that is, the back of the blade was blunted for safer handling. Thin blades were further reduced to smaller pieces, often having a geometric form such as triangular, square, or trapezoidal, called microliths. These small bits of sharp flint were cemented (using resin) into a groove in a piece of wood to form a tool with a cutting edge longer than it was feasible to produce in a single piece of brittle flint; examples are a spear with a long cutting edge or the farmer’s sickle of later date.

The second major mechanical invention of the Upper Paleolithic was the bow, a device even more effective than the spear-thrower for increasing the distance between the hunter and the hunted. It is difficult to date precisely, for the only evidence of its use is found in cave paintings. Mere finds of rock points without bows prove nothing because such tips were used on the projectiles of spear-throwers. The earliest representations of the bow come from North Africa from 30,000 to 15,000 bce. Once the bow had been devised, it spread with astonishing rapidity, its effectiveness making it the weapon par excellence. When the bow was pulled, it stored the gradually expended energy of the archer’s muscles; this energy was suddenly released to give the projectile a “muzzle velocity” far higher than that possible from a spear-thrower and of superior accuracy. It was a principal weapon through the 15th century ce and was ousted then only by gunpowder.