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Microscopic and electronic microprobe studies carried out on the chlorite-amphibole schists and the metadiabases from the vicinity of Vrteska determined an actinolite, Mg-hornblende, biotite, epidote, chorite, albite, calcite, quartz, and ilmenite assemblage. The metamorphic mineral assemblage and structural-textural characteristics indicate that these rocks metamorphosed in conditions of regional dynamothermal metamorphism in a Barovian type series of facies which, according to the degree of metamorphism, corresponds to the transition from quartz-albite-epidote-biotite to quartz-albite-epidote-almnadine subfacies. The chemical composition of actinolite and hornblende indicate that the rocks under investigation metamorphosed in conditions of prograde metamorphism at T = 400-500°C and P = 2-5 kbar.

The paper presents the lithostratigraphic, neotectonic and seismotectonic characteristics of the Pelagonian, Poreč and Kičevo depressions and the surrounding horsts. The area under consideration belongs to two geotectonic regions - the Pelagonian massif and the Western Macedonian zone which have had a complex multiphase geotectonic evolution. During the Neotectonic stage, owing to the intense tectonic development, morphostructures of uplift (blockhorsts) and subsidence (depressions-grabens) were formed along reactivated older and newly-developed neotectonic fault structures. The neotectonic fault structures are of various degree of seismic activity. The analysis of data from earthquakes makes possible to distinguish two seismic zones – Kičevo and Bitola, – in which earthquakes with a magnitude of up to 5.5 could be anticipated.

The Tikveš Paleogene basin is located in the central part of the territory of Macedonia and belongs to the central part of the Vardar zone. The flora collected in the sandstone-clay sediments from the lower flysch lithozone from the Serta locality (Tikveš basin) has been recorded and described for the first time in Macedonia. One species from the fossil flora has been identified as Equisetum parlatorii. These new findings provide information on the past and present distribution and history of Equisetum and exemplify the importance of biogeographic and evolutionary processes in the geological past. As one of the reasons for the reduction in the size of today's Equisetum from the recent vegetation, the significant climatic changes that were the result of the Himalayan orogeny during the Late Miocene are assumed.