A fossil assemblage containing molluscs, mammals, insects, ostracodes, and plants has been recovered from a silt-filled depression near Lima, in west-central Illinois. This paper presents and interprets the fossil molluscs, vertebrates, and insects
Late Quaternary vegetation and climatic history of the Long Valley area, West-Central Idaho, U.S.A.
C 14 dating ; Climatic variation ; Deglaciation ; Idaho ; Palaeo-environment ; Palynology ; Pollen diagram ; Quaternary ; Tephrochronology ; United States of America
Valley area of west-central Idaho. Results and discussion.
California ; Dating ; Geochronology ; Isotope dating ; Nevada ; Pleistocene ; Quaternary ; Stratigraphic correlation ; Tephrochronology ; United States of America ; Volcanic ash
The age of the Rockland tephra, which includes an ash-flow tuff south and west of Lassen Peak in northern California and a widespread ash-fall deposit that produced a distinct stratigraphic marker in western North America, is constrained to 565,000
to 610,000 yr by direct dating using Ar 40/Ar 39 and U-Pb methods and by stratigraphy. Identification of Rockland tephra in ODP core 1018 offshore of central California is an important stratigraphic age that also constrains the eruption age to between 580,000
Detecting structural climate change: an air mass-based approach in the NorthCentral United States, 1958-1992
Air mass ; Atmospheric circulation ; Climatic variability ; Global change ; Model ; Season ; Synoptic climatology ; Temperature ; United States of America
in this approach. Changes in their distribution and characteristics point to modifications in the mid-latitude general circulation. The integrated method air-mass classification scheme was applied to this problem in the northcentral United States (NCUS) over
Empirical climate change studies are more beneficial when they go beyond simply reporting fluctuations in average temperature. Ideally, dynamic causes of the change should also be addressed. The analysis of air masses can play a central role
Islam, gender, and slavery in West Africa circa 1500: a spatial archaeology of the Kano palace, northern Nigeria
Archaeology ; Cultural studies ; Historical geography ; Islam ; Nigeria ; Settlement system ; Sexual discrimination ; Sixteenth Century ; Slavery ; State
The paper highlights the utility of a reworked Foucauldian mode of spatial analysis in understanding the dynamics of state formation in Islamicized West Africa. North African cultural innovations are introduced in this palace. Spatial oppositions
emphasize the importance of paternity in increasing the authority of the king. Male state affairs are sited in or near public domains while female state-household activities are located in the secluded palace interior. Islamic forms of seclusion develop
Mexico ; North Dakota ; Planification ; Pollution ; Pollution de l'eau ; Protection de la nature ; Qualité de l'eau ; Ressource en eau ; Ressource naturelle ; South Dakota ; Stockage ; Système ; Utah ; Utilisation de l'eau ; WestNorthCentralStates
Arizona ; Besoin en eau ; Colorado ; Conflit ; Consommation ; Eau souterraine ; Economie de l'eau ; Economie de l'énergie ; Energie ; Etats-Unis ; Exploitation ; Gestion ; Géographie de l'Amérique ; Hydrocarbure ; Montana ; Mountain States ; New
The AA. examine evidence for climatic change at the Aubrey Clovis site, north-central Texas, over the past 14,000 yr. The primary emphasis of this paper will be on stable isotopic evidence from pedogenic and lacustrine carbonates from the study site
The chemistry of water in the Cambrian-Ordovician aquifer in six midwestern states has been studied as part of the Northern Midwest Regional Aquifer-System Analysis of the US Geological Survey. The differences in isotopic ratios between groundwater
Action biogène ; British Columbia ; Canada ; Etats-Unis ; Grès ; Littoral ; Météorisation ; Oregon ; Sel ; Taffoni ; Vitesse d'érosion ; Washington State
Biogenic process ; British Columbia ; Canada ; Coastal environment ; Erosion rate ; Oregon ; Salt ; Sandstone ; Taffoni ; United States of America ; Washington State ; Weathering
Honeycomb weathering occurs in two environments in Late Cretaceous and Eocene sandstone outcrops along the coastlines of south-west Oregon and north-west Washington, USA, and south-west British Columbia, Canada. In both environments, cavity
Geomorphologic effects of large debris flows on channel morphology at North Fork Mountain, eastern West Virginia, USA
Carrying capacity ; Fluvial erosion ; Geomorphometry ; Mass movement ; Mudflow ; Sediment budget ; Spatial variation ; United States of America ; Vegetation ; Virginia ; Watershed
Four debris flows on North Fork Mountain were selected for detailed study : Austin Run and Kisamore Run from the 1949 storm and Twin Run and Gravel Lick Run from the 1985 storm. Based on the distribution of deposits and eroded surfaces, up to four
Agriculture ; Autoroute ; East South CentralStates ; Etats-Unis ; Géographie de l'Amérique ; Interstate highway system ; Localisation ; Production agricole ; Produit agricole ; Réseau routier ; South Atlantic States ; Southern States ; Sélection
Dynamic controls on wind erosion and dust generation on west-central Free State agricultural land, South Africa
Afrique du Sud ; Agroclimatologie ; Eolien ; Erodabilité ; Erosion éolienne ; Free State ; Poussière éolienne ; Pratique culturale ; Propriétés du sol ; Rugosité ; Seuil ; Transport éolien
Aeolian dust ; Aeolian features ; Aeolian transport ; Agricultural practice ; Agroclimatology ; Erodibility ; Free State ; Roughness ; Soil properties ; South Africa ; Threshold ; Wind erosion
The west-central part of South Africa's Free State Province falls within the transition zone between South Africa's sub-humid, temperate grasslands to the east, and the semi-arid Karoo and arid Kalahari to the south and west, respectively
[b2] Dep. of Geography, Univ. of the Free State, Bloemfontein, Afrique du Sud
East Midlands ; England ; Glaciation ; Géographie physique ; Pléistocène ; Quaternaire zones moyennes ; Royaume-Uni ; Terrasse ; West Midlands ; Wolstonien
. The westward limit of the Oadby Till facies and its transition into contemporaneous western till is described. Final reference is made to the triple glaciation of west and north Birmingham.
An account of the original concept of the Wolstonian is followed by a statement of opposing views about its age. Then follows a consideration of its fauna, its relation to the terraces of the river Thames and the source of materials of its tills
Les problèmes du développement de l'espace en Europe centrale
Espace ; Europe ; Europe centrale ; Géographie politique ; Organisation de l'espace
Central Europe ; Europe ; Political geography ; Space ; Spatial organization
In this study, an attempt is made to outline the development of the spatial pattern of the region's states, some significant stages of the changes through the history and the inter-relationship between them. The AA. try to forecast the future
spatial model of region. In their opinion, the best alternative for the region is to join the European Community and the North Atlantic Treaty Organisation. - (ZK)
Weathering and soil development on fan surfaces as a function of height above modern drainageways, Roan Mountain, North Carolina
Alluvial cone ; Chronosequence ; Drainage ; North Carolina ; Pedogenesis ; Piedmont ; Relative dating ; Slope dynamics ; Soil ; Soil properties ; United States of America ; Weathering
Chronoséquence ; Cône de déjection ; Datation relative ; Drainage ; Dynamique de versant ; Etats-Unis ; Météorisation ; North Carolina ; Piedmont ; Propriétés du sol ; Pédogenèse ; Sol
This study is an intensive investigation of weathering and soil-development properties involving the description and analysis of 20 soil profiles on the west and south piedmont slopes of Roan Mountain. In addition, a quantitative effort is made