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The depositional history of the Bonneville Salt Flats, a perennial saline pan in Utah's Bonneville basin, has poor temporal constraints, and the climatic and geomorphic conditions that led to saline pan formation there are poorly understood. We explore the late Pleistocene to Holocene depositional record of Bonneville Salt Flats cores. Our data challenge the assumption that the saline pan formed from the desiccation of Lake Bonneville, the largest late Pleistocene lake in the Great Basin, which covered this area from 30 to 13 cal ka BP. We test two hypotheses: whether climatic transitions from (1) wet to arid or (2) arid to wet led to saline pan deposition. We describe the depositional record with radiocarbon dating, sedimentological structures, mineralogy, diatom, ostracode, and portable X-ray fluorescence spectrometer measurements. Gypsum and carbonate strontium isotope ratio measurements reflect changes in water sources. Three shallow saline lake to desiccation cycles occurred from >45 and >28 cal ka BP. Deflation removed Lake Bonneville sediments between 13 and 8.3 cal ka BP. Gypsum deposition spanned 8.3 to 5.4 cal ka BP, while the oldest halite interval formed from 5.4 to 3.5 cal ka BP during a wetter period. These findings offer valuable insights for sedimentologists, archaeologists, geomorphologists, and land managers.
This is the first volume on the history of the Nile Delta to cover the c.7000 years from the Predynastic period to the twentieth century. It offers a multidisciplinary approach engaging with varied aspects of the region's long, complex, yet still underappreciated history. Readers will learn of the history of settlement, agriculture and the management of water resources at different periods and in different places, as well as the naming and mapping of the Delta and the roles played by tourism and archaeology. The wide range of backgrounds of the contributors and the broad panoply of methodological and conceptual practices deployed enable new spaces to be opened up for conversations and cross-fertilization across disciplinary and chronological boundaries. The result is a potent tribute to the historical significance of this region and the instrumental role it has played in the shaping of past, present and future Afro-Eurasian worlds.
Where, when, and under what circumstances did money first emerge? This Element examines this question through a comparative study of the use of shells to facilitate trade and exchange in ancient societies around the world. It argues that shell money was a form of social technology that expanded political-economic capacities by enabling long-distance trade across boundaries and between strangers. The Element examines several cases in which shells and shell beads permeated throughout daily life and became central to the economic functioning of the societies that used them. In several of these cases, it argues that shells were used in ways that meet all the standard definitions of modern money. By examining the wide range of uses of shell money in ancient economic systems around the world, this Element explores the diversity of forms that money has taken throughout human history. This title is also available as Open Access on Cambridge Core.