Geological Society, London, Special Publications, 2000
... Luminescence techniques have traditionally been applied to sediments from a range of aeolian ... more ... Luminescence techniques have traditionally been applied to sediments from a range of aeolian environments (eg Ollerhead et al. 1994; Clarke et al. 1996; Rendell & Sheffer 1996; Clarke & Rendell 1998; Wintle et al. ... ' I ' I ' & ' I i oo ooO o~ oo o ~ o o 04 eO ~!sue;ul 0 0 ...
Abstract The estimation of water content since deposition presents a major source of uncertainty ... more Abstract The estimation of water content since deposition presents a major source of uncertainty in the thermoluminescence dating of sediments. In the case of loess, information on dry density, porosity, pore size distribution, microstructures and behaviour during laboratory compaction tests may be used to obtain estimates of water content during burial. The results of laboratory studies of loesses from northern Pakistan are presented and their implications for the TL dating of loesses from different stratigraphic horizons are explored.
For the last half-century, the story of very early hominids, and their stone industries, has been... more For the last half-century, the story of very early hominids, and their stone industries, has been almost exclusively ‘in Africa’. This first report of a very early industry takes the story ‘out of Africa’ and into the Indian sub-continent – that is, in a geographical direction towards the early industries of eastern Asia.
Severe soil erosion and landsliding affect 17% of the land area of Italy. The semi-arid zones of ... more Severe soil erosion and landsliding affect 17% of the land area of Italy. The semi-arid zones of the south of Italy and the islands of Sicily and Sardinia are particularly prone to erosion by virtue of a combination of climatic factors and high relative relief. Such areas are also prone to hazards such as forest fires. Soil conservation projects have achieved some success, but in some areas problems of erosion are being exacerbated by changes in agricultural land use.
... JH BLANKE, EW PRICE, HM RENDELL, J. TERRY and PD TOWNSEND University of Sussex, Fulmer, Brigh... more ... JH BLANKE, EW PRICE, HM RENDELL, J. TERRY and PD TOWNSEND University of Sussex, Fulmer, Brighton, Sussex, BNI 9QH7 UK and A. G. WINTLE Godwin Laboratory, University of Cambridge, Cumbs., CB2 3RS, UK ...
Measurements of infrared stimulated luminescence (IRSL) emission spectra are presented for detrit... more Measurements of infrared stimulated luminescence (IRSL) emission spectra are presented for detrital potassium-rich feldspars separated from sands and for museum specimens of low albite and intermediate microcline. The samples show common emission bands at 335, 400 and 550 nm and a thermally unstable emission band at 290 nm which is associated with sodic phases in the crystal structure. Rapid preheating and room temperature storage causes a decrease in emission from the 290 nm centre with a corresponding increase in the other emission centres, with potential problems for pulse annealing routines. This may be due to charge transfer or structural transformations in the defect. A sustained preheat regime is essential if detrital potassium-rich feldspars are to be used for IRSL dating.
Inorganic dusts from different herbs and spices are investigated in this study using both standar... more Inorganic dusts from different herbs and spices are investigated in this study using both standard thermoluminescence measurements of integrated intensity versus temperature and measurements of the thermoluminescence emission spectra (intensity as a function of both temperature and wavelength). The importance of particular minerals in the composition of glow peaks detected is discussed. Thermoluminescence emission spectra of the samples studied reveal
Journal of Archaeological Science - J ARCHAEOL SCI, 1980
The Pleistocene sequence of the northern areas of Pakistan, which have abundant evidence of palae... more The Pleistocene sequence of the northern areas of Pakistan, which have abundant evidence of palaeolithic industries, is discussed in the light of our own field observations and of recent published studies. It is clear that the pioneering work of de Terra & Paterson (1939) needs to be fundamentally re-examined using modern, interdisciplinary, approaches. We describe a sequence of Pleistocene and Holocene deposits from the northern Peshawar Basin near the ruined Buddhist monastery of Takht-i-Bahi. Pleistocene lacustrine siltstones and red weathered deposits are discussed and compared with other deposits both within the Peshawar Basin and in the adjacent Potwar region. A Holocene colluvium of soil, slates and schists is interpreted as indicating landscape changes due to erosion following the abandonment and probable destruction of the monastery in the latter part of the 5th century AD.
Recently developed techniques for time series analysis are applied to channel width and slope ser... more Recently developed techniques for time series analysis are applied to channel width and slope series collected in small ephemeral channels in Southern Italy. Tests for the difference between trend and difference stationarity, although developed in the field of econometrics, are found to be more suitable for data generation processes in geomorphology, where physical causes of deterministic trends are evident. These tests are important because the modeling of causal flows and development of dynamic predictive models depends on the type of data generation process that is identified. The ephemeral channel data exhibit trend stationarity and the results of spectral analysis and vector autoregression analysis of detrended channel width and slope data are described.
Geological Society, London, Special Publications, 2000
... Luminescence techniques have traditionally been applied to sediments from a range of aeolian ... more ... Luminescence techniques have traditionally been applied to sediments from a range of aeolian environments (eg Ollerhead et al. 1994; Clarke et al. 1996; Rendell & Sheffer 1996; Clarke & Rendell 1998; Wintle et al. ... ' I ' I ' & ' I i oo ooO o~ oo o ~ o o 04 eO ~!sue;ul 0 0 ...
Abstract The estimation of water content since deposition presents a major source of uncertainty ... more Abstract The estimation of water content since deposition presents a major source of uncertainty in the thermoluminescence dating of sediments. In the case of loess, information on dry density, porosity, pore size distribution, microstructures and behaviour during laboratory compaction tests may be used to obtain estimates of water content during burial. The results of laboratory studies of loesses from northern Pakistan are presented and their implications for the TL dating of loesses from different stratigraphic horizons are explored.
For the last half-century, the story of very early hominids, and their stone industries, has been... more For the last half-century, the story of very early hominids, and their stone industries, has been almost exclusively ‘in Africa’. This first report of a very early industry takes the story ‘out of Africa’ and into the Indian sub-continent – that is, in a geographical direction towards the early industries of eastern Asia.
Severe soil erosion and landsliding affect 17% of the land area of Italy. The semi-arid zones of ... more Severe soil erosion and landsliding affect 17% of the land area of Italy. The semi-arid zones of the south of Italy and the islands of Sicily and Sardinia are particularly prone to erosion by virtue of a combination of climatic factors and high relative relief. Such areas are also prone to hazards such as forest fires. Soil conservation projects have achieved some success, but in some areas problems of erosion are being exacerbated by changes in agricultural land use.
... JH BLANKE, EW PRICE, HM RENDELL, J. TERRY and PD TOWNSEND University of Sussex, Fulmer, Brigh... more ... JH BLANKE, EW PRICE, HM RENDELL, J. TERRY and PD TOWNSEND University of Sussex, Fulmer, Brighton, Sussex, BNI 9QH7 UK and A. G. WINTLE Godwin Laboratory, University of Cambridge, Cumbs., CB2 3RS, UK ...
Measurements of infrared stimulated luminescence (IRSL) emission spectra are presented for detrit... more Measurements of infrared stimulated luminescence (IRSL) emission spectra are presented for detrital potassium-rich feldspars separated from sands and for museum specimens of low albite and intermediate microcline. The samples show common emission bands at 335, 400 and 550 nm and a thermally unstable emission band at 290 nm which is associated with sodic phases in the crystal structure. Rapid preheating and room temperature storage causes a decrease in emission from the 290 nm centre with a corresponding increase in the other emission centres, with potential problems for pulse annealing routines. This may be due to charge transfer or structural transformations in the defect. A sustained preheat regime is essential if detrital potassium-rich feldspars are to be used for IRSL dating.
Inorganic dusts from different herbs and spices are investigated in this study using both standar... more Inorganic dusts from different herbs and spices are investigated in this study using both standard thermoluminescence measurements of integrated intensity versus temperature and measurements of the thermoluminescence emission spectra (intensity as a function of both temperature and wavelength). The importance of particular minerals in the composition of glow peaks detected is discussed. Thermoluminescence emission spectra of the samples studied reveal
Journal of Archaeological Science - J ARCHAEOL SCI, 1980
The Pleistocene sequence of the northern areas of Pakistan, which have abundant evidence of palae... more The Pleistocene sequence of the northern areas of Pakistan, which have abundant evidence of palaeolithic industries, is discussed in the light of our own field observations and of recent published studies. It is clear that the pioneering work of de Terra & Paterson (1939) needs to be fundamentally re-examined using modern, interdisciplinary, approaches. We describe a sequence of Pleistocene and Holocene deposits from the northern Peshawar Basin near the ruined Buddhist monastery of Takht-i-Bahi. Pleistocene lacustrine siltstones and red weathered deposits are discussed and compared with other deposits both within the Peshawar Basin and in the adjacent Potwar region. A Holocene colluvium of soil, slates and schists is interpreted as indicating landscape changes due to erosion following the abandonment and probable destruction of the monastery in the latter part of the 5th century AD.
Recently developed techniques for time series analysis are applied to channel width and slope ser... more Recently developed techniques for time series analysis are applied to channel width and slope series collected in small ephemeral channels in Southern Italy. Tests for the difference between trend and difference stationarity, although developed in the field of econometrics, are found to be more suitable for data generation processes in geomorphology, where physical causes of deterministic trends are evident. These tests are important because the modeling of causal flows and development of dynamic predictive models depends on the type of data generation process that is identified. The ephemeral channel data exhibit trend stationarity and the results of spectral analysis and vector autoregression analysis of detrended channel width and slope data are described.
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Papers by Helen Rendell