Many water-stressed regions of the globe have a highly seasonal precipitation regime. However, seasonality in the past and under changing climates is little studied. Submonthly records of sclerochronological δ18O and δ13C values of Melanopsis shells from the Jordan River Dureijat archaeological site (JRD) in the upper Jordan River valley presented here document the hydrology of paleo-Lake Hula. These records were assessed for changes in seasonal hydrology in the lake and compared with modern shells collected from present-day waterbodies in northern Israel and with models of δ18Oshell. Results from shells in sediments dating from the last glacial maximum (LGM) to the Bølling-Allerød imply changes in waterbody size that qualitatively parallel changes in the late Pleistocene Lake Lisan levels; Hula Lake was well buffered when Lake Lisan stood at a high stand and poorly buffered when water levels were lower. Furthermore, data from shells dated to the LGM suggest inflowing water with lower δ18O values than local rainfall, providing evidence for a greater proportion of snow in the catchment than today. Reconstruction of water δ18O and mixing-model calculations suggest that snowmelt contribution to spring water during the LGM may have been more than twice the amount in the modern-day catchment.

How hunter-gatherers manipulated and utilised their natural surroundings is a widely studied topic among anthropologists and archaeologists alike. This focuses on the Natufian culture of the Late Epipalaeolithic period (c. 15–11.7 kyr), the last Levantine hunter-gatherer population, and specifically on the earliest composite tools designed for harvesting. These tools are widely referred to as sickles. They consisted of a haft into which a groove was cut and flint inserts affixed. This revolutionised harvesting and established it on new grounds. While the plants manipulated by these tools are yet to be identified with certainty, it is evident that these implements were rapidly integrated and dispersed throughout the Natufian interaction sphere, suggesting that they provided a significant advantage, which probably constituted a critical step toward agriculture. At the same time, the Natufian haft assemblage demonstrates high morphometric variability. We review the available data concerning Natufian hafts and offer three possible models to explain the noted variability. We conclude that while these models are not mutually exclusive, this varied technological pattern is best understood as deriving from a protracted formative phase of technological development, progressing through incremental processes of trial and error.

Wetlands are a key archive for paleoclimatic and archeological work, particularly in arid regions, as they provide a focus for human occupation and preserve environmental information. The sedimentary record from 'Ayn Qasiyya, a spring site on the edge of the Azraq Qa, provides a well-dated sequence through the last glacial–interglacial transition (LGIT) allowing environmental changes in the present-day Jordanian desert to be investigated robustly through this time period for the first time. Results show that the wettest period at the site preceded the last glacial maximum, which itself was characterised by marsh formation and a significant Early Epipaleolithic occupation. A sedimentary hiatus between 16 and 10.5 ka suggests a period of drought in the region although seasonal rains and surface waters still allowed seasonal occupation of the Azraq region. Archeological evidence suggests that conditions had improved by the Late Epipaleolithic, about the time of the North Atlantic Younger Dryas. The changes between wet and dry conditions at the site show similarities to patterns in the eastern Mediterranean and in Arabia suggesting the Jordan interior was influenced by changes in both these regions through the LGIT climatic transition.