inscription
Portail d'information géographique

Résultats de la recherche (19 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • New geomagnetic paleosecular-variation results from the Old Crow Basin, Yukon Territory, and their use in stratigraphic correlation
  • 1989
  • in this paper are based primarily on more recent geomorphic and stratigraphic data from a number of dated localities throughout the region, with a variety of supporting evidence from paleontology and archaeology.
  • 1989
  • The AA. present micromorphology data which support stratigraphic relationships suggesting that colluvial processes were important in the formation of basal loess mixed zones in addition to other possible mixing processes such as pedoturbation
  • 1989
  • Stratigraphic and petrographic study of foredeep molasse sediments, which provide a detrital record of the evolution of the southern Himalayas during the tectonic collision of central Asia and India.
  • 1989
  • The AA. interpret the sedimentological, pedological, stratigraphic and thermoluminescence data as indicating that the period of loess deposition in the Kashmir valley dates to the last 200,000 yrs, with loess deposition and palaeosol formation
  • 1989
  • Examples of relict features inherited from various earlier periods of different climate (ranging from Tertiary to early Holocene) are described from surface soils in central and north-west Europe. Special emphasis is placed on stratigraphic evidence
  • 1989
  • This review emphasizes the stratigraphic and spatial implications of paleosols to Quaternary research. A brief history of the evolution of soil geomorphology is presented. Details from two earlier investigations in the state of Iowa and one from
  • 1989
  • The AA. describe the pollen and stratigraphic records of three sites on the Point Reyes. These sites provide a well constrained chronology for the changes in both vegetation and geomorphic processes that occurred during the Pleistocene-Holocene
  • 1989
  • . Tills in the headwaters region of the ancient Mississippi drainage system in Minnesota and Wisconsin occur in the appropriate stratigraphic position and have colors and mineralogic compositions that suggest they could be the parent till of the Roxana.
  • 1989
  • The stratigraphical record and the morphological correlation to the Nahe terraces show that the latest glacis development took place during the Würm glacial and another during the Riss glacial. By analogy it was concluded that the older, higher
  • 1989
  • Sites were established where sediments and water throughout the stratigraphic section were collected and analyzed. Chemical analyses indicate enriched concentrations of cadmium, copper, manganese, and zinc in sediments and porewater, and arsenic
  • 1989
  • Under semi-arid environmental conditions, the syngenetic contribution of two agents of transport (glacial, glaciofluvial) in forming one accumulation complex produces stratigraphic and phenotypical features that are rare in the glacial morphology
  • 1989
  • Using stratigraphic and depositional data, the AA. have sorted out some of the individual tectonic, paleoclimatic, and sea-level signals contained in the sedimentary record of the Salisbury Embayment, Baltimore Canyon Trough, and Hatteras Basin
  • 1989
  • geomorphic, structural, and stratigraphic data. The final section examines the spatial relationship between areas of historical tectonism and seismicity and areas of inferred, longer-term Cenozoic deformation.
  • 1989
  • of the instability of inactive fan sediments. The AA. use detailed geological and geomorphological mapping and interpretation to show how faulting and stratigraphic variations have created slump features, subsidence zones, scarpettes and cemented colluvium aprons
  • 1989
  • of the surficial stratigraphic record to evaluate the long-term effect of catastrophic events on the Appalachian landscape.
  • 1989
  • This paper presents an outline of lithologic and morphologic developments in the alluvial environment of the Mark Basin in Central Belgium during Post Glacial times. By means of about 900 borings the spatial arrangement and stratigraphic position
  • 1989
  • Stratigraphically the loess/palaeosol sequences fall into two broad types : a thicker sequence (20 m) containing 10 clearly defined palaeosols| and a thinner sequence (6-10 m) containing 5 or 6 palaeosols. The characteristics of the palaeosols
  • 1989