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The alkali basaltic volcanic field in Southern Slovakia/Northern Hungary covers area about 150 km2. Products of this volcanism in Southern Slovakia extend over the Lucenec basin and Cerova Highlands continuing into northern Hungary.
Volcanic fields include lava flows, cinder and spatter cones, dykes, maars and diatremes. In this area have been recognised two formations: the Podrečany Formation of Pontian age and Cerova basalt Formation of the Pliocene - Quaternary age. Volcanic activity of the volcanics in the Lucenec basin and Cerova Highlands took place during six volcanic phases.
The Podrečany Formation includes remnants of lava flows along the western margin of the Lucenec basin (Podrečany and Mašková) and a group of maars nearby the willages Jelšovec and Pinciná. Lava flows coming in centres at the north followed valleys southward and reached the limnic basin of the Poltár Formation. K/Ar radiometric ages (6,44±0,47 Ma) correspond well to biostratigraphic data of the poltár Formation of Pontian age, which was deposited in a fluvial/limnic environment contemporaneously with volcanic activity.
Maars were formed in the area of sedimentary basin over a thick sequence of early miocene sedimentary rocks. Phreatic eruptions that formed maar depressions were followed by phreatomagmatic eruptions giving rise to tuff rings/cones. Maar sediments are represented by diatomaceous clays and/or alginites (Pinciná).