the development of a flint tool

The figure depict the changes in an ancient stone tool from 25.000 to 5.000 years in the past.

Twenty five thousand years ago, the size of the stone tool was approximately 8 centimetres in height and around 4 cm in widht.  From the front, the texture of the stone looks roughh with a square shaped bottom edge for cutting.  In comparison with the front profile, the rear view appears to have a rougher surface.  Viewed from the side, the object appears to have a pointed edge, and measures around 2 cm at the top and about 1.5 cm at the bottom.

Twenty thousand years later, the size of the object has increased by about 2 cm in botth height and width.  In contrast, the side of profile is much thinner than the eatlier specimen, measuring only about 1 cm across.  In addition, the latter specimen is smoother with one exception that the unchipped section extends to the bottom of the blade.

To summarize, there are many differences between the flint tool of 25,000 years ago and the example from 3000 BC, in terms of texture, size and chipping. The differences suggest that the stone had been modified to become a more effective tool to support ancient people's activities.