The paleomorphostructural schemes of the Atlantic Ocean are compiled and its development during Meso-Cenozoic is described based on the materials of the geologic-geophysical studies. The three stages are distinguished: a) the ocean opening (Late Yurastsic-Early Cretaceous), b) main morphostructures formation (Late Cretaceous-Early Paleogene), c) the neotectonic stage (Late Paleogene-recent time). The lateral and vertical tectonic movements, fractures and faults, volcanism and sedimentation controlled the formation of the ocean bottom morphostructure.

Analysis of geomorphic features of the Curacao Island reveals the controlling influence of the neotectonic (post-Lararnian) stage of its development, when striped system of block morphostructures came into being. Differentiated movements of the blocks as well as the marine abrasion processes predetermined the type of the recent relief of the island. Comparative geomorphological analysis of the Curacao and other islands of the Great and Small Antillean arc is considered as a crucial to the understanding of geological and geomorphic development of the Caribbean Basin as a whole.

The paper describes a method of mapping structural correspondence between the present-day (topographic) surface and deep surfaces of discontinuity. A coefficient of correlation is used as an index of degree and direction of the relation. The method is based on so called «moving window» technique and allows to get distinct and correct idea on spatial pattern of correspondence degree for objects of any dimension.

For the Russian Plain area maps have been compiled showing structural correspondence of the surface and basement relief, each map showing the relation for the forms of certain size: 100, 250 and 450 km. The picture of structural correspondence varies significantly if the forms of different scale (dimension) are considered and is quite variable within limits of individual orographic units of the Russian Plain.

The method of paleogeomorphological analogies, worked out in the case of the Black Sea Sochi coast, is suggested for evaluating the degree of slope stability and a spatial forecasting of the possible areas of landslides. This method in essence presupposes that profiles of some slope are reconstructed for the moment of time directly preceding a landslide and thus concrete critical geometric slope parameters are established.

The paper describes the first attempt of paleogeomorphological analysis of the complicated heterogeneous relief of Bulgaria. Relief evolution from Pre-Paleozoic till Pleistocene is considered in relation to tectonic regime and paleogeographic conditions changes. 10 main stages are identified as objects for special paleogeomorphological studies. Some scientific and applied tasks of paleogeomorphology in Bulgaria are specified.

Varieties of environment control features and deversity of channel deformations at Siberian rivers. Within the whole Siberia however several large regions can be outlined, each region having more or less homogenous conditions of channel development and character of the channel deformations. Floodplain relief is also uniform as it results from the channel development. At places where geological conditions limit the channel migration the floodplain is underdeveloped, its width is often less than the channel width at low water, the surface is flat and bare and their distribution is fragmentary. Such floodplains can be found at mountain rivers at the South and North-East of Siberia, as well as at the Middle Siberian plateau. At plains where river channels may migrate freely floodplains are usually broad, their character depending on physical-geographic conditions. At northern plains braided channels prevail which result from high effective discharge. At the South of Siberia floodplains are more steady, with pronounced topography (troughs, broad ridges etc), Permafrost and activity of the floating ice account for levelled relief and bogging of the floodplain surface. At some regions the floodplain topography is partly modeled by wind.

Direct in-situ stress measurements in the upper earthcrust showed the existence of geostatic fields within rock stress caused by their weight and geodynamic fields with lateral tectonic stresses. The usage of gamma-metric method allows carrying out the detail study of interstate and composition of compressive stress fields and zones of postorogenic and present earthcrust dilatation.

Zonality of the tectonic stress state of the earthcrust is an important geomorphological factor. The negative landforms develop within the limits of dilatation zones which are characterized by increase in rock facility and decrease in rock solidity properties. This connection is especially well pronounced in erosive valleys. In some cases, however, the connection of valleys with dilatation zones is less distinct and there are cases of coincidence of the valleys with compression zones. Zonality of the tectonic stressed state of the earthcrust determines the intensity of the surface modelling and underground karst forms development.

The correlation is discussed existing between hypsometric position and special features of the solid rocks composition, Large positive morphostructures (outlined by residual minima of gravity) were proved to consist of rocks characterized by low density (σ=2,57-2,65 g/cm³) and rather high content of the silicon oxide, their chemical composition being close to that of moderately acid rock - granodiorite. Large morphostructural depressions characterized by residual maxima of gravity consist of dense basic rocks (σ=2,75-2,90 g/cm³), their average chemical composition corresponding to diorite. Taking into account the structures of the upper layers of the earthcrust, both kinds of morphostructures can be explained within the frame of the Pratt-Heyford isostatic model. However some «anti-isostatic» morphostructures occasionally occur, which are blocks of dense rocks uplifted to a considerable height and lowered blocks of low density.

Main river valleys of the North-East Vietnam, i.e. valleys of Kau, Luknam, Thyong, Hakoi, Kalong and others are alike in structure and in the history of development. River terraces are connected with sea terraces and are dated on the basis of this correlation as well as on the spore-pollen analysis data. Their age ranges between Holocene and Early Pleistocene.

General regularities are stated of the structure and formation of mangrove coasts of Guinea. Geomorphologic role of mangroves is noted which stabilize coasts, control tidal waves, favour accumulation of sand and clay and lessen sea abrasion. Mangroves have been known to exist since Paleogene, they developed during the periods of both considerable regressions (100-110 meters below the present-day sea level) and transgressions (up to 25-50 meters above the present-day sea level). Shift of the mangrove area during that time amounts to 100 kilometers and more.

A fundamental geographic work on karst by the Hungarian researcher of karst, professor at the University of Szeged, doctor of geographical sciences Laszlo Yakuch "Morphogenesis of karst areas: variants of karst evolution".

On the intermontane depressions geomorphology in works of Azerbaijan scientists

Engineering morphodynamics of coasts

Studies of the recent movements of the earthcrust

Sea geomorphology problems at the Ist All-Union congress of