Summary Quantifying the capacity of soils to immobilize sorbing contaminants of concern relies on batch sorption experiments, typically performed at skewed solid-to-liquid ratios. The geophysical method spectral induced polarization (SIP) provides a powerful non-invasive monitoring alternative that can capture changes in soil electrical properties driven by contaminant sorption, yielding an approach whereby immobilization can be monitored in situ. Here, we present SIP signals obtained from a series of columns packed with a water saturated natural sandy-loam soil, with and without solid organic matter (SOM) amendment, contaminated with increasing concentrations of the herbicide paraquat. Our results highlight that soil polarization drops proportional to increasing amounts of sorbed paraquat in the SOM-free soil, exhibiting a Langmuir-type leveling-off behavior. The addition of 8%-SOM yielded an increase in both the real (σ') and imaginary (σ'') conductivity of the uncontaminated treatment, driven by the contribution of charged sites in the SOM. Further, SOM modified the dependence between σ'' and sorbed paraquat, likely driven by continued polarization within the polydisperse SOM with continued paraquat addition. However, the time constant ($\tau $), derived using the Cole-Cole model, shed light on a saturation-type dependence governed by a drop in ion mobility with increasing sorption. Thus, aiding the interpretation of sorption-driven SIP signals.

This paper argues that certain early Palaeolithic artefacts can be viewed as reflecting Readymade concepts and techniques from the world of modern art. I will focus on presenting a theoretical framework for this claim as well as a case study from Late Lower Palaeolithic Qesem Cave, Israel (420,000–200,000 bp). The case study is based on the ‘double patina’ phenomenon (old tools that became patinated by exposure to the elements and were then shaped again). These items, characterized by outstanding colours and textures, were produced following Readymade concepts and techniques applied in the production of tools that are both functional and mnemonic. I suggest that these items acted as mnemonic memory tools that reconnected their users to ancestral (human and non-human) beings as well as to familiar experiences, events, and places.

This paper presents a new techno-typological analysis of a sample of small flakes that were produced through recycling from discarded blanks at the Late Neolithic and Early Bronze Age site of Ein-Zippori, Lower Galilee, Israel. This study shows that the systematic production of small flakes from previously discarded blanks was not related to a scarcity in raw materials, but rather to specific decisions concerning the types of tools needed to complete necessary tasks. These results are supported by use-wear analysis noted briefly here and presented in more detail in a separate paper. The results indicate that recycling was a significant lithic production trajectory during the Late Neolithic and Early Bronze Age. Recycling also contributes to the variability in lithic assemblages from those cultural periods.

The behaviour and mobility of hominins are dependent on the availability of biotic and abiotic resources, which, in temperate ecosystems, are strongly related to seasonality. The objective of this study is to establish evidence of seasonality and duration of occupation(s) of specific archaeological contexts at late Lower Palaeolithic Qesem Cave based on the study of ungulate teeth. Combining individual ageing using dental eruption and replacement with variability measurement of tooth microwear, we estimated the seasonality of occupations at different levels of the site and their relative duration. Information about the diet of the ungulates and the habitats where they were hunted was also derived from tooth mesowear and microwear analyses. In the different tooth assemblages analysed, where the fallow deer was the most abundant herbivorous species, animals were selectively hunted in specific habitats. For example, the fallow deer individuals brought back to the Hearth area had a different diet than those found in other parts of the cave. The Hearth area seems to have been used seasonally, probably during short-term events and more than once a year. The other areas of the cave show different seasons of game procurement and different patterns of occupation of the site, possibly more than once a year or, alternatively, for a longer period. The data suggest that Qesem Cave was inhabited by human groups for a long period, perhaps not continuously, and their knowledge of the environment surrounding the cave allowed them to allocate specific game, most probably from distinct hunting grounds, to designated activity areas at the cave. We hypothesise that the difference in feeding locations might have been related to specific needs of the cave inhabitants (food, hide and marrow extraction), and thus, animals from different hunting grounds were wisely used to maximise the potential of specific habitats in the environment. This study is an additional testimony to the ingenuity of the cave inhabitants that allowed them to persistently use the cave for a prolonged period in a year.

Flint tools exhibiting modified patinated surfaces (“double patina”, or post-patination flaked items) provide a glimpse into Paleolithic lithic recycling, stone economy, and human choices. Different life cycles of such items are visually evident by the presence of fresh new modified surfaces alongside old patinated ones (according to color and texture differences). New modifications testify to a gap in time between the previous life cycle of the patinated flaked item and its new one. The aim of the current study is to reconstruct the functional properties and life cycles of a sample of modified patinated flaked tools from Late Acheulian Revadim, Israel by applying use-wear and residue analyses. The results of the functional study allow a better understanding of the practical reasoning behind the collection and recycling of old flint tools, while additional inputs from theoretical and methodological advancements assist in reconstructing their probable role in the worldviews of the site’s inhabitants.