摘要:

ABSTRACTSThis paper discusses a systematic difference between the results found when one series of Dark‐Age gold coins were analysed both by neutron activation and by specific gravity analysis and when a second series of similar coins was analysed by the Oxford Milliprobe and by specific gravity. No reason is given for this systematic difference, although there is evidence that all three methods are slightly in error, two of them giving results for gold which are too high and the specific gravity method giving results which are too lo

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1972.tb00055.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

ABSTRACTSTwo contexts from the Colombian sites, Yotoco Ferry and Moralba, had been linked by archaeological similarities in pottery style, and dated by association with ware from other sites atcircaa.d.1000. However, radiocarbon dating of those contexts set Moralba atcirca800b.c., some 2000 yr older than Yotoco Ferry. Thermoluminescent dating of pottery from Yotoco Ferry dated it atcircaa.d.900, and pottery from Moralba was dated atcircaa.d.870.In addition a metal‐smelting pottery crucible, thought to be prehispanic, was studied by thermoluminescence and dated, on the contrary, at less than 120 yr ol

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1972.tb00056.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

ABSTRACTSThe ‘spurious’thermoluminescent glow from ground samples of flint is responsible for dating errors in the region of 10 000 years for grains less than 45 μm diameter or of 4000 years for larger grains. The glow is partly tribothermoluminescence and partly regeneration thermoluminescence and the conditions in which these arise or are accelerated have been found. It is shown that if thin polished slices are used rather than powder, the amount of such glow is neglig

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1972.tb00057.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

摘要:

ABSTRACTSThis paper considers the presentation of the results of the mechanical analysis of cave sediments, suggesting that the use of grain size parameter scatter diagrams is preferable to the older method of cumulative percentage frequency graphs. A sequence of samples was taken from an ideally‐situated cave, the Badger Hole at Wookey, and first subjected to the standard soil analytical tests, followed by a detailed mechanical analysis. It is hoped that this preliminary work will encourage a more quantitative approach to granulometric analysis for archaeological purposes, leading eventually to the extraction of more precise environmental data from cave sediment

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1972.tb00058.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1972.tb00059.x

出版商:Blackwell Publishing Ltd    

年代:1972

数据来源: WILEY