The boring activities of Polydora BOSC. 1802, are an important agent in bioerosion. Trace fossils attributed to this worm are very common. From data collected on Recent representatives of Polydora ciliata JOHNSTON 1838, it is evident that the boring
mechanism of this worm is to be interpreted as a combination of mechanical and chemical processes. Dodecaceria, another genus of polychaete worms, is considered to be able to bore chemically in lime-rich substrata. (AIS).
Sorption de bore sur des matières en suspension dans les cours d'eau et son bilan dans l'océan
Absorption ; Argile ; Bore ; Charge en suspension ; Cours d'eau ; Eau de mer ; Hydrochimie ; Kaolinite ; Océan
Etude expérimentale de la sorption du bore à partir de l'eau de mer sur les principaux minéraux de la matière en suspension des eaux continentales. L'élimination du bore a lieu non seulement par pénétration des matières en suspension des rivières
Etude de la répartition des concentrations de ces trois éléments dissous plus le calcium. On observe un comportement faiblement non conservatif du strontium et du calcium et conservatif pour le fluor et le bore.
slip over a one year period in a 137 m holed at the top of the flow line on an ice-cap in northern Ellesmere Island. However, the bore hole has deformed to an elliptical cross-section near the bed and some pronounced extrusion-like layers have developed
Postglacial paleogeography in the Tokoro and Sarobetsu lowlarids, Hokkaido, is discussed based on facies and fossil analyses of undisturbed boring cores.
Some types of deformations are difficult to recognize in exposures and unrecognizable in bore holes. The failure to recognize that glaciotectonic disturbances occur leads to mistaken constructions, not only stratigraphical but also
Measurements of rills, borings, to estimate the volume of colluvial deposits in dry valleys and in enclosed depressions and cultivation on experimental plots show that structural stability is very influential in erosion control. In some plots mean
Some recent borings N.E. of Tiège cut an important thrust fault with overlapping of the Cambrian on the Eodevonian. The authors describe from the cores the dip and strike of the fracture and the characteristics of the thrust zone proper. (LW).
The pollen analysis of a boring, completed with four C dates, shows the evolution of the landscape since the end of the Atlantic period. The formation of the peat dated 5445120 B.P. gives evidence for a stopping of the flandrian transgression
L'A. veut établir l'impact de l'ancienneté de l'irrigation sur les microéléments contenus dans les sols : cuivre, zinc, manganèse, bore, molybdène. Prévision des microéléments à apporter au sol pour accroître le rendement d'un champ de coton.
Interglacial foraminiferal faunas are described from Holsteinian, Eemian and Holocene deposits in borings from Cuxhaven area. These assemblages are compared with published faunal lists from corresponding interglacial deposits in NW Germany
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
Holocene emergent reefs and notches are well distributed on Rota and Guam. Relative sea-level changes at these islands are reconstructed based on geomorphological observations and borings on present and emergent reefs, together with 54 radiocarbon