The lower Colorado River valley : a Pleistocene desert
Colorado River Valley ; Domaine aride ; Etats-Unis ; Géographie de l'Amérique ; Histoire de la végétation ; Pléistocène supérieur ; Quaternaire zone chaude ; Végétation ; Zone subtropicale
A chronological sequence of plant macrofossil assemblages from twenty-five pack rat middens provides a record of desert scrub vegetation for most of the last 13,380 yr BP from a hyperarid portion of the lower Colorado River Valley.
Valley asymmetry with steeper west-facing valley sides is a common feature in the Tertiary Hills of Lower Bavaria. The purpose of this study is to examine the relation between this drainage and valley asymmetry and to review the possible causes
Geomorphological evidence for fluvial change during the Roman period in the lower Rhone valley (southern France)
. analyse the palaeohydrological functioning of the lower Rhone valley between the 2nd century BC and the 2nd century AD as well as discuss its palaeoclimatic significance in relation to the upper and middle river valley.
The hydrological and geomorphological dynamics of the lower Rhone river are studied during the Roman period. The crossing of archaeological and radiocarbon dating methods allow to study events at a pluridecadal to centennial scale. Therefore the AA
Late Quaternary geomorphic evolution of the lower Narmada valley, Western India : implications for neotectonic activity along the Narmada-Son Fault
Drainage network ; Fault ; Geomorphology ; Gujarat ; India ; Neotectonics ; Quaternary ; Seismicity ; Stratigraphy ; Valley ; Vertical movement
Geomorphic data combined with stratigraphic studies provide significant information to constrain timing and amount of fault movement. The lower Narmada valley lies astride the Narmada-Son Fault (NSF), an important ENE-WSW-trending tectonic element
Narmada valley. The AA. discuss the geomorphic evolution of the lower Narmada valley in relation to neotectonic movements along the NSF.
responsible for the current intraplate seismicity being experienced in the central part of the Indian plate. Varying nature and degree of tectonic movements along the NSF during Late Pleistocene and Holocene have produced 4 geomorphic surfaces in the lower
Fine resolution palaeoecology confirms anthropogenic impact during the Late Holocene in the Lower Hawkesbury valley, NSW
Australia ; Ecosystem ; Floodplain ; Holocene ; Human impact ; Humid environment ; New South Wales ; Palaeo-ecology ; Palaeo-environment ; Prehistory ; Riparian vegetation ; Sedimentation ; Settlement ; Valley
This paper uses a range of palaeoecological techniques, applied at fine resolution, to gain a better understanding of the lower Hawkesbury Valley over the last 820 years. By examining land-system response to Aboriginal and European management
The next collectionof papers on the evolution of Vistula and tributary valleys includes synthetic reviews on various reaches: Vistula near the junction with Raba (by P. Gębica), lower Dunajec (by T. Sokołowski), middle reach of Wisłoka (by L
paleomeanders in the upper Vistula valley (by T. Kalicki and V.P. Zernickaya) and lower Wisłoka (by L. Starkel and W. Ganoszewski). Two other papers by T. Kalicki and M. Krapiec from Wisłoka valley discuss the importance of endrochronological method for dating
. Strakel), transversal gap of the Middle Vistula (by W. Pożaryski and T. Kalicki) and lower reaches of several tributaries of the Lower Vistula (by L. Andrzejewski). There are also detail sedimentological and palynological studies on two lateglacial
Note on the origins of the dry zone of the Limpopo Valley
Cloud bands over the western Indian Ocean are bimodally distributed in space. On mode crosses South africa and the second mode Malagasy. The Limpopo valley lies between the modes and it is proposed that this fact explains the relatively low rainfall
The chronology and long term dynamics of a low energy river system : the Kelvin Valley, central Scotland
This report provides new radiocarbon (C 14) dated sediment stratigraphic data from a third aggrading low energy fluvial system in Scotland, in the upper reaches of the Kelvin Valley in central Scotland to clarify the chronology and dynamism
of fluvial and valley forming events and to explore cause in sediment generation. It suggests that aggradation is an early-mid-Holocene phenomenon in these paraglacial valleys, and observes that in the Kelvin Valley, as in the Milfield basin, sedimentation
Experimental study of wind directional variability in the vicinity of a model valley
Aeolian features ; Aeolian transport ; Aerosol ; Atmospheric pollution ; Experimentation ; Modelling ; Topography ; Valley ; Wind ; Wind speed
This paper reports the results of a preliminary study examining the effects of valley presence on airflow direction and focuses on valleys situated in areas of low relief. Wind tunnel experiments are used to visualise near-surface airflow over
a series of models representing valleys oriented at different angles to mean airflow. This study has significance to the modelling of pollution dispersal and also aeolian sediment and nutrient dynamics in desert regions.
Geomorphology ; Hungary ; Orogeny ; Stream ; Valley ; Valley floor evolution
of these unconsolidated sea deposits started the development of the valley of the Csernely Creek at the end of the Lower Miocene and in the Middle Miocene age. In the meanwhile the Palaeozoic rocks under these Miocene deposits had been lifted by tectonic movements and all
The western part of the Uppony Mountains consists of mainly Palaeozoic (Ordovician-Permian) rock. At the lower parts of the Mountains, where the Csernely Creek springs, the rock is of unconsolidated sea deposits from the Lower Miocene age
. In present days the Csernely Creek cuts into the higher relief Palaeozoic rock and crosses it through a narrow gorge. There is one explanation for this. The Palaeozoic rocks must have been covered with the Lower Miocene rocks. On the top
the Miocene cover eroded. This disinterred surface (between Nekézseny and Uppony) inherited the meandering valley of the Csernely Creek. - (AM)
Evidence of lower-atmospheric ozone sloshing in an urbanized valley
Aerosol ; Arizona ; Atmosphere ; Atmospheric circulation ; Ozone ; Pollution ; Summer ; United States of America ; Urban area ; Valley ; Weather type
The aim of this research was to reveal evidence of the complete diurnal process by which high concentrations of lower-atmospheric ozone are typically transported across the Phoenix (Arizona) Valley. The spatial and temporal patterns of diurnal
transports of ozone produced a sloshing of the aerosol along the eastern side of the valley basin, affecting the eastern metropolitan population twice daily.
Quaternary sandstones and conglomerates found on the valley-sides of the lower Vistula River have been identified as a product of precipitation of CaCO3 under the stagnant Middle-Vistulian ice sheet. The model of precipitation of CaCO3 is attributed
Homoclinal ridges in Lower Saxony in Landforms and landform evolution in West Germany.
Recent investigations of structure-controlled landforms such as homoclinal ridges agree that, in general, these landforms are transitional stages within a landform development sequence that includes valley deepening, valley widening, pediment
Danube ; Floodplain ; Hungary ; Lowervalley ; Town ; Water ; Water management ; Water supply
The main aim of the paper is to present the unsustainable conditions of water supply of Pécs and to detect the main reasons behind it. First the special role of the flood plain along the Lower Danube Valley in the water supply of the town