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established its limits according to the geological structure, landforms and other geographic components (floras, soils, human settlement and economic activities, etc.), as well as their dynamics resulted from the general evolution of the regional landforms. The present orohydrographic structure was interpreted as the result of the combination between the geological structure and the cyclic landform evo- lution; it also influenced the human settlement and land use. The detailed analysis of the geologic structure is demonstrated in three


sections – profiles (east-west) based on literature documentation and espe- cially on his own punctual analyses; the existence of two important faults (located in the saddles Bucecea and Strunga), a fracture (toward the Molda- vian Hilly Plain) and some ripples generated by tectonics in upper Sarmatian when the region emerged. The detailed analysis of the landforms developed from the upper Sar-


matian to the Quaternary (structural plateaus on grit stone and eggy lime- stone bordered by cuesta and subsequent valleys; three erosion surfaces generated by three complete evolution cycles and an intermediate level of an incomplete cycle; 4 terraces on the main valleys located under 110 m relative altitude); their correlation with similar landforms in other units of the Moldavian Plateau or the Subcarpathians; their integration within a major evolution sys- tem that genetically involves tectonics (especially the intermittent uplifts) and the level oscillations of the lake in south Moldavia in Pliocene. The correlation between the landform configuration (especially the cross valleys), the deposits of Carpathian origin in the saddles Bucecea and Rugio- nasa, and the sizable altitude range between the present river beds that side the main ridge made the author to state a drainage evolution model for the Pliocene and the Quaternary. The drainage developed by river captures, a process that still goes on. The author would come back to this problem in a later detailed paper. The last


section of this study focuses on landform influence


(orohydrographic structure, altitude, etc.) on other geographic components. Special regard was given to vegetation and human settlement because they show better the inter-conditioning connections in the landscape. In the first case, the vegetation is ranged in tiers from the grasslands in the Moldavian Plain, to the oak forests limiting the hills (especially the saddles Bucecea and Rugionoasa) and the beech forests of the central high area. The evolution of the limits between them is compared with the soil evolution, and their variation is correctly connected with climate changes and human settlement develop- ment. Their temporal and spatial evolution was based on the archaeological data, the maps from the 18th-19th centuries and the statistic data. The first re- sult was a continuous human living process since the antiquity, but different on sectors - the contact areas with the adjacent units were more inhabited (especially the saddles Bucecea and Rugionoasa) where there were flat lands proper for agriculture, while the inner region (narrow valleys, massiveness,


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