Dating recent alluvial sediments in the Wicklow Mountains
Aminostratigraphy ; C 14 dating ; Dating ; Flood ; Floodplain ; Geochronology ; Holocene ; Ireland ; Palaeosol ; Sedimentology ; Stratigraphy
Modern floodplain sediments in the Wicklow Mountains display a stratigraphy and sedimentology that contrasts them with earlier Holocene alluvium. This paper presents the results of a C 14 dating programme the objects of which were to date : a) more
definitively their commencement throughout the Wicklow Mountains, and b) their internal stratigraphies with a view to establishing a flood chronology. Although the results show that the immediate research aims cannot be achieved using C 14 dating they have lead
L'éclipse totale du 11 août 1999 dont on écrit soigneusement ici les moments et les effets, constitue l'occasion d'une description plus générale du phénomène. - (NF)
Problems and possible solutions concerning radiocarbon dating of surface marine sediments, Ross Sea, Antarctica
Antarctica ; C 14 dating ; Dating ; Diatom ; Holocene ; Marine quaternary ; Marine sediment ; Organic materials ; Spatial distribution ; Statistics
This paper uses statistics to examine some of the problems associated with radiocarbon dating the organic fraction of Antarctic marine sediments and offers some explanations for the observed geographic variability in the age of surface sediments.
This paper describes a comparatively simple quality assurance method which they have developed in an attempt to assess the accuracy of their own luminescence dates produced by single aliquot dating procedures. It is applicable to all samples and has
Luminescence dating applications in geomorphological research
Dating ; Glacial features ; Interglacial ; Quaternary ; Research technique ; Sedimentary ; Thermoluminescence
This paper provides a summary of the principles of the luminescence (especially optical) dating methods and shows how recent developments (specifically single aliquot dating procedures) have dramatically enhanced the scope and potential
Arizona ; C 14 dating ; Canyon ; Dating ; Fluvial dynamics ; Isotope dating ; Mudflow ; United States of America ; Watershed
In this study, the AA. report 3He dates for the oldest surfaces on debris flows in Prospect Canyon and use them with conventional 14C dates and photographic evidence to estimate the frequency of the late Holocene debris flows that have affected Lava
Depuis le printemps de 1998, on a commencé à éétablir des mesures régulières de ce taux à la station d'Apatity. A la saison d'hiver-printemps de 1998 et 1999, ce taux dépassait fortement celui relevé à la station de Mourmansk les années précédentes
. On présente les résultats de mesure de ce taux pendant l'éclipse solaire du 11 août 1999.
Dating fluvial terraces with 10Be and 26Al profiles : application to the Wind River, Wyoming
Dating ; Fluvial terrace ; Fluvioglacial features ; Isotope dating ; Methodology ; Moraine ; Tephrochronology ; United States of America ; Wyoming
Dating depositional surfaces like terraces that are older than the range of 14C is difficult. The AA. employ a cosmogenic radionuclide (CRN) profile technique that addresses a major problem of CRN dating on such surfaces : nuclide inheritance
. By measuring 10Be and 26Al profiles, the AA. constrain the exposure age and the mean CRN inheritance for the deposit. Here they report their attempts to date terraces along the Wind River, which are inferred to reflect oscillation between glacial
and interglacial conditions in the headwaters, and compare the results with other dating methods.
Classic and new dating methods for assessing the temporal occurrence of mass movements
C 14 dating ; Comparative study ; Dating ; Dendrochronology ; Geochronology ; Landslide ; Lichenometry ; Mass movement ; Methodology ; Natural hazards
the applicability of different methods for determining landslide chronologies, frequencies and dynamics in relation to the type of material being dated, sampling location, and type of mass movement. The emphasis is on the possibilities and limitations
of the different dating methods. The paper focuses on new analytical techniques like AMS, TIMS, and new dating methods like OSL and ART.
Meteorological observations in 1999 at the Arctic Station, Qeqertarsuaq (Godhavn), Central West Greenland
Albédo ; Date1999 ; Donnée climatique ; Groenland ; Manteau nival ; Météorologie ; Radiation ; Région polaire ; Station expérimentale ; Température de l'air ; Température du sol ; Vitesse du vent ; Zone froide
Présentation des enregistrements météorologiques réalisés, au cours de l'année 1999, dans la station arctique de Qeqertarsuaq, Groenland : température moyenne annuelle de l'air, température du sol, manteau nival, vitesse du vent, radiation solaire
Au cinquième rang des années les plus chaudes jamais enregistrées, 1999 a été marquée par de nombreux phénomènes météorologiques extrêmes, particulièrement dévastateurs : inondations meurtrières en Inde, au Venezuela et au Viêt Nam, cyclones
Dating the lower Paleolithic open-air site of Holon, Israel by luminescence and ESR techniques
Archeological site ; Coastal plain ; Dating ; Geochronology ; Israel ; Palaeolithic ; Palaeomagnetism ; Quaternary ; Thermoluminescence
The open-air Acheulian site in Holon was dated by the luminescence methods (TL and OSL) and by electron spin resonance (ESR). This site, in the coastal plain of Israel, is situated within Quaternary aeolianites and paleosols.
C 14 dating ; Dating ; Holocene ; Palaeogeography ; Peat ; Sweden ; Wood
trunk in the sandur of the stream St Göljån was radiocarbon dated to 1320 C 14 years B.P. The lowermost part of a peat sequence in a soligenous mire in the valley of the stream Tangån was radiocarbon dated to 1455 C 14 years.
Floodplain sedimentation during an extreme flood : the 1999 flood on the Tar River, eastern North Carolina
Charge en suspension ; Cours d'eau ; Crue ; Date1999 ; Etats-Unis ; North Carolina ; Ouragan ; Phénomène exceptionnel ; Plaine d'inondation ; Saison ; Sédimentation ; Taux de sédimentation
This paper examines floodplain sedimentation following the 1999 flood of the century on the Tar River. Hurricane Floyd made landafall just 10 days after Hurricane Dennis in September 1999. The AA. used suspended sediment concentrations measured
on the Tar River from 1958-1967 to suggest that the seasonal timing and sequencing of flood events in 1999 are the most probable explanations for the minimal geomorphic impact of this extreme flood.
Composition ethnique ; Date 1982 ; Date1999 ; Evolution démographique ; France ; Ile-de-France ; Migration intérieure ; Paris ; Population ; Recensement de la population ; Structure démographique
Nombre et mobilité des habitants de l'Ile-de-France de 1982 à 1999. Nombre et répartition des étrangers dans les limites de l'Ile-de-France. Evolution dans la structure par âges de cette population de 1982 à 1999. Structure par secteur d'activité de
cette population en 1998. Composition socio-professionnelle de la population active en 1999.
Catastrophe ; Crue ; Date 1997 ; Date1999 ; Dégât ; Lutte contre les inondations ; Monde ; Réchauffement climatique
Caractérisation des crues des continents du monde dans les années 1997-1999. Pour chaque continent, on donne et on analyse les données des échelles des crues : leur nombre, durée, nombre de victimes et de personnes évacuées, dommages en dollars
Australia ; Cenozoic ; Dating ; Glacial erosion ; Glaciation ; Lateglacial ; Moraine ; Palaeogeography ; Tasmania
This paper reports new geomorphological mapping, and reviews the extent, dating, pattern, and nature of past glaciation of the Tasmania's Central Plateau. The Last Glacial Maximum (LGM) ice limits on the southern part of the Central Plateau