Variation in Nemrut Dag obsidian at Pre-Pottery Neolithic to Late Bronze Age sites (or: all that's Nemrut Dag obsidian isn't the Sicaksu source)

Nemrut Dag volcano was a highly important obsidian source in the ancient Near East for millennia, and its circular caldera is a conspicuous landmark on the landscape. In contrast to its archaeological relevance as an obsidian source, Nemrut Dag was poorly understood for decades, starting with the work of Renfrew and col-leagues. Fortunately, in the last decade or two, archaeologists not only have geological studies from which to draw information about the volcano but also have conducted their own research, including the work of Robin (2017) and colleagues (Robin et al., 2015, 2016; Khalidi et al., 2016). One key finding is that all of the tested Nemrut Dag obsidian artifacts from a variety of sites match the chemical fingerprint of an outcrop near the village of Sicaksu. Since then, it has been presumed that the Sicaksu outcrop is the source for Nemrut Dag obsidian artifacts at sites in various regions and times. In contrast, four types of Nemrut Dag obsidian, including the Sicaksu type, occur among the artifacts at Kortik Tepe, Domuztepe, and Tell Mozan, at which there are indications of a diachronic change. Developing our knowledge of field relationships among the types of Nemrut Dag obsidian advances our ability to make behaviorally relevant interpretations.