The granulometric composition and sorting of loesses and interbedded soils are studied for stratigraphic subdivision and correlation of the loess-paleosol sequence in Moldova. Distinctive features of loess and paleosol horizons of different age
are identified and general characteristics of the mineral composition are described that together with other lithological characteristics, improve reliability of stratigraphic operations.
Several Holocene tephra deposits of Hayes volcano constitute a marker horizon in southern and east-central Alaska. Their identification is aided by high amphibole/pyroxene ratio and biotite in trace amounts, unique among Holocene tephra deposits
In order to understand the reason(s) why a specific stratigraphicalhorizon is used for cave development the AA. sampled 18 inception horizons of 6 cave systems as well as the surrounding rock mass. This paper only presents and discusses the results
of the measurements of the primary rock permeability. The results indicate that the initial permeability contrast is not sufficient to explain alone the concentration of karst development along inception horizons. However, it is noticed that 3 types of inception
horizons can be distinguished: type 1, where cave inception took place within the inception horizon and where the permeability of the inception horizon was slightly higher than that of the surrounding rock mass; type 2, where inception took place
at the interface between the inception horizon and the surrounding rock mass, and where the permeability of the inception horizon is slightly lower than the surrounding rock mass; type 3, where the cave development took place along bedding plane fractures.
A study on the lower boundary of Quaternary in North China. Stratigraphic significance of the Matuyama/Gauss boundary in Loess and the Quaternary: Chinese and Hungarian case studies.
indicate that the horizon bearing Equus is consistent with the M/G boundary approximately. (DLO).
The Mount Edgecumbe tephra deposits, a marker horizon in southeastern Alaska near the Pleistocene-Holocene boundary
The AA. correlate tephra samples from several sites, and interpret the radiocarbon data to propose an age range for the sequence of tephra layers. In any case, the Mount Edgecumbe tephra deposits are a widespread, latest Pleistocene stratigraphic
Humus horizons associated with 13 solifluction lobes on a single slope were radiocarbon dated at fixed distances behind the risers, as well as ahead of the lobes. The dated horizons, together with stratigraphic observations of planar discontinuities
Investigations were carried out in the Don, Upper Oka, Middle Volga basins, the Ural Foreland, souther part of the West-Siberian plain and in Soviet Central Asia and Georgia. 15 Pleistocene stages are identified with the corresponding stratigraphic
Dynamique du paysage ; Eurasie ; Evolution du relief ; Géosystème ; Horizon stratigraphique ; Héritage géomorphologique ; Morphopédologie ; Paléo-environnement ; Patrimoine naturel ; Paysage ; Structure du paysage
Le paysage moderne est capable de garder longtemps dans sa structure les traces de son passé, de son évolution. On peut l’apercevoir aussi bien dans la composition des horizons pédologiques que dans la structure morphologique des paysages. Le
California ; Domaine aride ; Etats-Unis ; Géographie physique ; Holocène ; Horizon argileux ; Marqueur stratigraphique ; Paléosol ; Pédogenèse ; Quaternaire zones moyennes ; Sebkha ; Sol
2000yr. Such soils can be used as stratigraphic markers, but could be confused with other desert soils with clay-accumulation horizons (Haplargids) which occur much more commonly on desert alluvial fans, are mostly late Pleistocene or older, and do
A visually prominent desert soil with a horizon of clay accumulation (Typic Natrargid) has formed under an arid climate in Panamint Valley, California, in sandy, very calcareous, saline fan alluvium in less than about 3500yr, and probably less than
Paleosols as stratigraphic indicators for the Cenozoïc history of Northeastern Brazil
un horizon B peu endurci. Les sols latéritiques du Pléistocène inférieur présentent une phase de maturité initiale, des zones de lessivage et de concentrations ferriques. Les sols pléistocènes supérieurs et holocènes se présentent comme des podzols
Dislocation of Eemian peat in a deglaciation succession : stratigraphical implications for the Neubrandenburg area
Poméranie, ayant montré que tous les sédiments observables appartiennent à la dernière glaciation et qu'aucun des niveaux tourbeux n'est in situ, il semble que le matériel organique des formations voisines soit aussi redéposé. Ainsi, de tels horizons ne
As recently as 7 years ago Quaternary geologists believed that there were no Pleistocene paleosols represented by non-peaty soil horizons (A, B, etc.) in Norway. However, several buried soils of this type have recently been reported and studied
by stratigraphic, magnetic and chemical methods. The presence of these buried Pleistocene paleosols in the interior of Norway (central part of the Fennoscandian glaciations) indicates that glacial erosion was locally less during several glacial cycles than
After summarizing the results of Quaternary climatic fluctuations in China, AA. describe the significance of the Lanzhou loess and paleosol sequence in Quaternary studies. Five stratigraphic units are identified with at least 21 intercalated
paleosols, TL, paleomagnetic and fission track dating techniques have been applied to determine the age of the loess horizons. Correlations are made with the terrace of the Yellow River and oxygen isotope curves of the Pacific deep-sea cores and the Vostok
Australia ; Dating ; Geochronology ; New South Wales ; Palaeo-environment ; Pedogenesis ; Podsol ; Quaternary ; Stratigraphic correlation ; Thermoluminescence
The AA. present a detailed thermoluminescence chronology of soil horizons from 11 late Quaternary coastal aeolian and barrier sedimentary sequencies along a 900 km stretch of coast in south-east Australia. The results show that in the majority
of cases the A and B horizons of what appear to be typical intact podzol profiles have widely disparate ages. The AA. suggest that these soil profiles have been subject to reworking. Although these soils give the appearance of being intact, they are in fact
sea level), and another two, which are only known by drilling cores, are present in the northern part of the hill (116 m and 91-93 m). An upper Weichselian loess cover is also present, which contains the most important stratigraphicalhorizons known
in the area : present soil, loess including laminae of granules, Tongued Horizon, Eltville Tephra. Older loess is only present in gullies and solution pockets. A residual gravel layer occurs below the loess throughout the area.
European part of Russia ; Geological structure ; Palaeosol ; Pedogenesis ; Pedostratigraphy ; Pleistocene ; Russian Plain ; Sedimentary rock ; Stratigraphicalhorizon
Arkhangelsk ; Dating ; European part of Russia ; Glacial features ; Lithostratigraphy ; Northern Dvina River ; Palaeogeography ; Quaternary ; Sedimentology ; Slope ; Stratigraphicalhorizon
utilisent le rapport des horizons pédogénétiques A1/A1B pour analyser l’érosion de pente et tiennent compte des conditions de température et d’humidité. Sur le plan topologique, la différenciation paysagère se traduit par les coefficients d’insolation et
d’humidité relative. L’intensité de l’érosion se calcule avec l'épaisseur résiduelle de l’horizon de l’humus qui est réparti sur la longueur de la pente des catenas et elle peut être déterminéé par les caractéristiques morphométriques des pentes (longueur et
This study revises the pedological record of the Rocourt-paleosol complex, an important pedo-stratigraphic marker for the Eemian and Early Weichselian. Soil morphological features and depth functions of X-ray diffraction, grain-size distribution
homogeneity of the parent material and suggests that it developed under a regime of fluctuating rates of primary dust deposition intermixed with periods of (fluvial) reworking of the dust. Strong weathering was identified in the lower stratigraphic unit
, supporting the general consensus that it formed during the Eemian in Saalian loess. The overlying A-horizons are clearly less weathered, and evidence for early recalcification indicates that deposition of unweathered, calcareous sediments gained importance
Soil horizons are the results of pedological processes and classes of soil horizon descriptions are seen as fundamental to soil classification. A fuzzy-sets approach to horizon classes is suggested to deal with the intergrading and multivariate