The earliest pottery found on the Korean peninsula dates from the beginning of the Neolithic Age, about 7000 BC.  Vessels were hand built from coils of clay and fired in open or semi-open kilns at low temperatures of about 700° C.  These unglazed, porous wares are found throughout Korea in large quantities and in a variety of shapes and decorative styles, reflecting the diversity of material culture of the Neolithic period and the contacts between populations living in different parts of the peninsula. Comb-patterned wares are the most representative type of ceramics from Korea's prehistoric period. This exceptionally large jar, which may have been used for storage of grains, has a typically pointed base and displays striking patterns of diagonal lines that were incised into the damp clay, perhaps with a comblike implement, before firing. Excavated at Amsa-dong, near the Han River in modern-day Seoul, it attests to the long history of human habitation at the site.  These vessels are found alongside other kinds of earthenware, such as bowls with linear relief decoration, and chipped  and polished stone tools of various types.