On the geochemistry of gases and noble gas isotopes (including 222Rn) in deep crustal fluids: the 4000 m KTB-pilot hole fluid production test 2002–03

The concentrations of H₂, O₂, CO₂, and concentrations and isotopic composition of the noble gases (including ²²²Rn), N₂, CH₄, and higher hydrocarbons dissolved in 4000 m deep‐seated fluids from a 12‐month fluid production test in the KTB pilot hole were analyzed. This determination of the gas geochemistry during the test in combination with the knowledge of the hydraulic data provides relevant information about the fluid hydraulics of the deep system. All gas concentrations and isotopic signatures, except for ²²²Rn, showed constancy during the course of the test. This, in combination with large fluid flow rates at a moderate water table drawdown, imply an almost infinite fluid reservoir in 4000 m depth. From the change in ²²²Rn‐activity as a function of pump rate, the contribution of smaller and wider pores to the overall fluid flow in an aquifer can be deduced. This ²²²Rn‐activity monitoring proved therefore to be a valuable instrument for the qualitative observation of the scavenging of pore and fracture surfaces, a hydraulic feature invisible to standard hydraulic testing tools. The observance of this scavenging effect is due to (i) the continuous on‐line geochemical monitoring, (ii) the durability of the test, (iii) a change in pump rate during the course of the test, and (iv) due to the short half‐life of ²²²Rn. The fluids have a 5.9% mantle He component, and a δ²¹Ne excess of 14%, and a noble gas model age of about (5.5–6.2) ± 2.0 Myr. The mean N₂/Ar‐ratio of 516 and δ¹⁵N‐data of about +1.5‰ indicates sedimentary or metamorphic origin of N₂. The hydrocarbons, amounting to 33 vol.% in the gas phase, are derived from thermal decomposition of marine organic matter of low maturity. But a key question, the identification of the potential source region of the fluids and the migration pathway, is still unidentified.     

Two Late Neolithic human skeletons,a recent discovery in the Netherlands

Recently, two Late Neolithic skeletons belonging to the Single Grave Culture (ca. 4500 BP) were discovered in the province of North-Holland. It is the first time that such complete and well-preserved skeletons of this age have been found in The Netherlands. Both skeletons were subjected to an extensive and close examination in order to gain more information about these two individuals and their way of life. Application of different methods resulted in the determination of the sex (a male and a female), the age at death and the stature of the skeletons. Pathological features could be established in the female skeleton by means of radiography. The male skeleton was incomplete owing to animal scavenging. The tooth marks on the bones were studied in an attempt to discover the circumstances of death. In order to obtain information about the diet of the two individuals, the dental microwear and the remains of plaque and calculus were investigated. This investigation demonstrates the importance of physical anthropological studies with regard to the reconstruction of life in the past.     

Feeding the scavengers. Actualistic taphonomy in the Jordan Valley,Israel

This paper describes the results of a 3‐year project carried out in the Jordan Valley, Israel, in which the influence of specific local environmental conditions, such as scavenging, weathering and scattering of carcasses, were related to the rate of their bone survival. During the 3 year period, the taphonomy of 16 whole animal carcasses, deposited in a nature reserve and agricultural cultivated area were compared. The exact age, date of death and weight of all animals was known. Results of animal scavenging activities on the carcasses, such as disappearance of bones and damage, such as tooth marks, breakage, gnawing to the leftover bones, were recorded at the end of the initial, intensive scavenging period (Phase I), and at later dates. Bone scattering maps were drawn at the end of Phase I and 2.5 and 3 years later. Weathering of surviving bones at the sites is described. Results show that in the Jordan Valley Nature Reserve, scavenging is the most important taphonomic agent causing total disappearance of all bones of young dairy calves, and reducing amount of bones remaining of more mature animals to a minimum. These small number of leftover bones, after only 2–3 years are the only candidates for eventual burial and fossilization. The loss of most of the bones through scavenging in the nature reserve might cause serious bias to conclusions about subsistence behaviour of prehistoric man. This is a taphonomic actualistic analogue to eventual conditions in prehistoric times. Copyright © 2000 John Wiley & Sons, Ltd.     

The Waste Commons in an Emerging Resource Recovery Waste Regime: Contesting Property and Value in Melbourne's Hard Rubbish Collections

Practices of scavenging of Melbourne's hard rubbish collections are examined in the context of an emerging resource recovery waste regime linked with policy shifts that promote resource recovery over disposal through landfill. Waste regimes have many parallels with regimes in natural resource management and contestations over property are an important but neglected aspect. Based on research conducted primarily in the south eastern suburbs of Melbourne, I argue that hard rubbish on the kerb‐side forms an informal ‘waste commons’ that facilitates various forms of revaluing of municipal household waste. Results of a survey conducted by householders scavenging of their own hard rubbish piles suggest that informal scavenging activities were more effective for diverting waste from landfill by recycling than the formal processes of council hard rubbish contractors. Interviews conducted with residents, waste management contractors and self identified ‘professional’ scavengers revealed different perspectives on the waste commons and highlighted the contested nature of property in hard rubbish. Together with the survey findings, they allow tentative conclusions to be drawn about the role of the waste commons in the transition from a regime of disposal through landfill to one focused on resource recovery.     

The effect of cooking on the survivorship of jackrabbit skeletons (Lepus californicus) presented to desert scavengers of the eastern Great Basin,North America

In order to study the effects of human processing decisions on consumption and destruction of small animal skeletons by scavengers, twenty‐six blacktailed jackrabbits were dry roasted or boiled and their skeletons presented to scavengers at various locations throughout the Sevier Desert of Utah. Skeletons of all samples were quickly and substantially destroyed, with roasted animals surviving at one‐half to one‐third the rate of their boiled counterparts. Survivorship of elements was unrelated to skeletal density in either case, but rather to the amount of adhering tissue, marrow, and fat. Axial elements tended to be preferentially destroyed, particularly in the case of roasting. These effects echo ethnographic and ethnoarchaeological observations on the relationship between cooking, length of site occupation, and small animal survivorship and carry clear implications for how we use the relative frequencies of large and small animals to interpret prehistoric subsistence. Copyright © 2008 John Wiley & Sons, Ltd.     

Hunting and Scavenging by Early Humans: The State of the Debate

During the last 25 years, there has been a shift towards the belief that early humans were scavengers instead of hunters. This revisionist interpretation has brought a reconciliation with the Darwinian paradigm of gradual progressive evolution that has traditionally guided (and very often, misled) an important part of anthropological thinking. However, empirical support for the scavenging hypothesis is still lacking. Recent data based on bone surface modifications from archaeological faunas suggest, in contrast, that hominids were primary agents of carcass exploitation. Meat seems to have been an important part of Plio-Pleistocene hominid diets. Passive scavenging scenarios show that this kind of opportunistic strategy cannot afford significant meat yields. Therefore, the hunting hypothesis has not yet been disproved. This makes the hunting-and-scavenging issue more controversial than before, and calls for a revision of the current interpretive frameworks and ideas about early human behavior.