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In this study rocks samples of Gyűrűfű Rhyolite Formation were observed from deep drillings at northern foreland of the Villany Mts. Remained cores and thin sections from Bisse–1, Peterd–1, Szava–1, Vokany–2, Egerag–7 and Szalanta–3 drillings were available in varying — but generally restricted — number for the petrographic reambulation. Based on the new petrographic descriptions and the previous reports, 2 main lithological groups were distinguished in the area: lava rocks and pyroclastites. Based on the mineralogical composition and texture the following rock types are distinguishable: (1) pyroclastites with rhyolitic composition (Peterd–1; Vokany–2, upper section; Egerag–7, upper section; Szalanta–3, upper section and presumably Bisse–1, upper section); (2) lava rocks with rhyolitic composition (Bisse–1, lower section; Szava–1; Vokany–2, lower section); (3) lava rocks with dacitic composition (Egerag–7, lower section); (4) lava rocks with rhyodacitic–dacitic composition (Szalanta–3, lower section). At northern foreland of the Villany Mts, the magmatic activity started with lava flows (creating a rhyolitic lava dome/lava flow in the area of Szava and Bisse–Vokany and rhyodacitic–dacitic lava rocks in the area of Egerag–Szalanta) and was followed by explosive eruptions, covering the area with thick ignimbrite sheets.

A Gyűrűfűi Riolit Formáció kőzettani vizsgálatának eredményei a Villányi-hegység északi előterében