The document discusses three types of stones from prehistoric times: Paleolithic, Mesolithic, and Neolithic. Paleolithic stones date back to the earliest Stone Age and are characterized by rough or chipped edges. The sample stone described has a rough, greyish body and sharp edges. Mesolithic stones come from the Middle Stone Age, between the Paleolithic and Neolithic periods. The sample discussed has some smooth areas and chipped corners, with beautiful orange, yellow, and white colors. Neolithic stones are from the Late Stone Age, known for polished implements. The sample stone is dark grey, oval-shaped, and very smooth and polished, with small dents and light markings