The ancient Sri Lankan city of Anuradhapura is currently the subject of one of the world's largest and most intensive archaeological research projects. Having traced its growth from an Iron Age village to a medieval city, the research team now moves to the task of modelling the surrounding landscape. Three seasons of fieldwork have located numerous sites of which the most prominent in the urban period are monasteries. Here is a clue about how the early urban hinterland was managed which has implications well beyond Sri Lanka.

Abstract:A high resolution quantitative granulometric record for site Uchediya [21°43'2.22" N, 73° 6'26.22" E; 10 m a. s. l.] gives understanding towards accretion history of the late Holocene flood plain in the lower reaches of Narmada River. Two sediment facies (sandy and muddy) and seven subfacies (sandy subfacies: St MS+FS+CS , Sm FS+MS , Sl FS+VFS , and St MS + CS ; muddy subfacies: Fm SILT+VFS+FS, Fm SILT+VFS+FS (O) and Fm SILT+VFS+FS (T)) are identified based on cluster analysis supplemented with sedimentary structures observed in field and other laboratory data. Changes in hydrodynamics are further deduced based on various sedimentological parameters and their ratios leading to arrive at a depositional model.

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This study attempted to probe a geologically more stable IR stimulated luminescence signal (IRSL) that explored so far. IRSL, probes the proximal pairs and, pIRSL measurements at elevated temperatures consume more distant pairs. We surmised that the residual IRSL after pIR-IRSL should arise from most distant pairs and hence should be more stable. A thermal stimulation after pIR-IRSL leads to redistribution of charges including distant pairs and this can be probed by further IRSL and pIRSL (post IR IRSL) measurements. This post IRSL following a thermal treatment is termed as redistributed IRSLs (RD IRSL and RD pIRSL) and contributes about 10% of total IRSL counts from a pristine sample. As expected, RD IRSL has a poor to be solar bleachability. Burial age of around 800 ka(with 30 -40 %) using RD-IRSL and RD-pIRSL were comparable with the palaeomagnetic dating and were a factor of three higher than conventional pIR-IRSL, TRL, IR-RL and VSL ages.

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