For some purposes this works well

Crude stone implements dating

Blades required a considerable degree of skill to produce without breaking, since they were thin enough to be fragile. The modern Amazonian toothed knife shown at right above is made of bone, with the teeth carefully notched into it. The small chips on the edge are from reworking. Some of the artifacts are certainly intrusions from more recent times, but until an excavation is at least started there can be no certainty as to the age of the earliest settlement.

We do in fact have

The prehistoric black one and the modern yellow one shown here are examples. Grasping the proximal surface, the hominid brought the distal surface down hard on an object he wished to detach or shatter, such as a bone or tuber.

Large flint pieces are scarce with only a few small pieces classified as finger tools or thumbnail tools. For present purposes, the examples given there can illustrate the genre. Although it is made of natural materials, it is not intended to represent any tool known to have been made before modern times. This example is from La Parrilla Valladolid, Spain. Toolmakers using these materials had to start by laboriously pecking the rock into the desitred shape, then finish the tool by grinding and polishing.

They were sharpened by knocking off

It would be reasonable to say that it is also a very thin tool. These pictures show objects in private collections. It was then fitted to the main shaft. An arrow head without the arrow is not entirely useless, but it won't work as an arrowhead that way. Those of us who have chosen to study these tools are left on our own in trying to determine how the tools were used, and how they were made.

We do in fact have some bone and wood tools from late Paleolithic times. They were sharpened by knocking off additional tiny chips along the edge, taking care to do it in such a way as to keep the edge reasonably straight. Compared with the simple chopper above, notice how the skillful removal of a series of flakes has produced a nearly perfectly straight cutting edge.

They tend to be named for their assumed functions, their shape, or a combination of both. Since a skilled stone knapper can produce an arrowhead, say, quite quickly, but may take much longer to produce a straight, feathered arrow, it was usual among hunters to use a two-part arrow shaft. This object is in the McCord Museum in Montreal. Hand-Axes Hand-axes are especially associated with the Acheulean tool tradition that followed Oldowan tools and was associated with Homo erectus life.

The pictures at the left show the tools found so far, grouped by their present classification. Furthermore, some tools identical in form may originally have been intended for different functions. That is an increase of about times.