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The Basta Diatrema
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The Basta Diatrema
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This geosite is can be visited.
History and value
Básti diatrema (diatrema): On the western edge of the village of Óbást, in the wall of the field road, is the excavation of the remains of a maar-type volcanic horn (diatreme). Given the location of the lava blanket of nearby Pogányvár, the currently excavated diatreme is approx. It was 300 meters below the surface. In the lower part of the excavation there is a megabrica with large blocks of sandstone and rhyodacite tuff. The blocks reach a diameter of 5 m. Presumably, they were caused by the collapse of the wall of the diarrhea (Konečný et al. 2004). Upwards, there are lapillary tuffs with decayed blocks, fine-grained tuffitic layers, followed by lapillary tuffs with basalt debris. Because basalt lava is absent, the age of the diarrhea cannot be determined radiometrically.
The Óbást - Pogányvár nature trail leads to the site.
Degree of protection: 2, Landscape Protection Area of Cseres Mountains.
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