Pre-Pottery Neolithic B (PPNB) is part of the Pre-Pottery Neolithic, a Neolithic culture centered in upper Mesopotamia and the Levant, dating to years ago, that is, 8800–6500 BC. It was typed by British archaeologist Kathleen Kenyon during her archaeological excavations at Jericho in the West Bank. Like the earlier PPNA people, the PPNB culture developed from the Mesolithic Natufian culture. However, it shows evidence of a northerly origin, possibly indicating an influx from the region of northeastern Anatolia. Lifestyle Cultural tendencies of this period differ from that of the earlier Pre-Pottery Neolithic A (PPNA) period in that people living during this period began to depend more heavily upon domesticated animals to supplement their earlier mixed agrarian and hunter-gatherer diet. In addition, the flint tool kit of the period is new and quite disparate from that of the earlier period. One of its major elements is the naviform core. This is the first period in which architectural styles of the southern Levant became primarily rectilinear; earlier typical dwellings were circular, elliptical and occasionally even octagonal. Pyrotechnology, the expanding capability to control fire, was highly developed in this period. During this period, one of the main features of houses is a thick layer of white clay plaster flooring, highly polished and made of lime produced from limestone. It is believed that the use of clay plaster for floor and wall coverings during PPNB led to the discovery of pottery. The earliest proto-pottery was White Ware vessels, made from lime and gray ash, built up around baskets before firing, for several centuries around 7000 BCE at sites such as Tell Neba'a Faour (Beqaa Valley). Sites from this period found in the Levant utilizing rectangular floor plans and plastered floor techniques were found at Ain Ghazal, Yiftahel (western Galilee), and Abu Hureyra (Upper Euphrates). The period is dated to between c. 10,700 and c. 8,000 BP or 7000–6000 BC. Plastered human skulls were reconstructed human skulls that were made in the ancient Levant between 9000 and 6000 BC in the Pre-Pottery Neolithic B period. They represent some of the oldest forms of art in the Middle East and demonstrate that the prehistoric population took great care in burying their ancestors below their homes. The skulls denote some of the earliest sculptural examples of portraiture in the history of art. Society Danielle Stordeur's recent work at Tell Aswad, a large agricultural village between Mount Hermon