Model of the structure of upper Miocene productive deposits odoptu area of the Okhotsk sea

Using the example of lower nutovsky thickness on Odoptu field discusses the possibility and efficacy of sequence-stratigraphic approach to integrated interpretation of seismic data and drilling materials. Sequence stratigraphic model, graph showing sea level changes and regional chronostratigraphic correlation chart with reference to the existing geochronological scale was developed for the formation of the sedimentary cover in the research area.

Chronology of Vegetation and Paleoclimatic Stages of Northwestern Russia During the Late Glacial and Holocene

We have studied 6 reference sections of bog and lake sediments in the Leningrad and Novgorod provinces to develop a geochronological scale for vegetational and paleoclimatic changes in northwestern Russia during the Late Glacial and Holocene. Every 10-cm layer along the peat and gyttja sections (4–8.5 m thick) was investigated palynologically and the great majority of them were radiocarbon dated. Using the data obtained, standard palynological diagrams were plotted and vegetation history reconstructed. The palynozones indicated on the diagrams were related to the climatic periods and subperiods (phases) of the Blytt-Sernander scheme. On the basis of 230 14C dates obtained, we derived the geochronology of climatic periods and phases, as well as the chronology for the appearance and areal distribution of forest-forming tree species. The uppermost peat layers were dated by using the “bomb effect”. We compared the stages of Holocene vegetation and paleoclimatic changes discovered for the Leningrad and Novgorod provinces with the those obtained for Karelia, which we had studied earlier using the same methodology.

Late Pleistocene Geochronology of European Russia

I constructed a Late Pleistocene geochronological scale for European Russia employing 14C dating and paleobotanical studies of several reference sections.

Late Precambrian geochronology of the European U.S.S.R.

Summary. The available data on radiometric dating of Riphean and Vendian deposits in the European part of the U.S.S.R. enabled us to establish the age of geochronological boundaries. The Riphean lower boundary was adopted as 1650 ± 50 Ma, the Vendian lower boundary as 650 ± 10 Ma, and the Cambrian lower boundary as 590 ± 10 Ma, making the total length of the Riphean about 1000 Ma and that of the Vendian about 60 Ma. This paper suggests a draft of the geochronological scale of the Late Precambrian.

Étude géochronologique des granites du Massif de Tafraoute (Anti-Atlas marocain)

A detailed study of the Tafraoute area granites points out the existence of a Cambrian granitization (with the present geochronological scale) in the Moroccan Anti-Atlas and allows to define in that granitic massif, up to now considered as an unique one, at least three types of granites with different ages and/or origin (Tafraoute: 530 m.y., Tahala: 1920 m.y., Tarsouat: undetermined).

A Note on the Zoogeographical History of North Western Europe

Sometime after the last retreat of the ice in the Quaternary ice age, the Scandinavian peninsula was separated on the south from the north German plain and Denmark. Later, England was cut off by the Channel from the continental land mass. An estimation of the times at which these two events happened is interesting to archaeologists, botanists and zoologists alike, because the communities with which they are concerned are affected by the barrier of an intervening arm of the sea.So far most of the evidence about the times of separation comes from botanical and archaeological sources, from pollen analysis and the investigation of cultural sites. In this paper the distribution and physiology of certain freshwater animals are used to provide argument that the separation of Scandinavia and of England could only have taken place at times of particular climatic conditions. The climatic definition of the times of separation makes it possible to fit them in to the absolute geochronological scale which has been established by Scandinavian workers.