The irregular phonolite laccolith penetrated into different levels of the Cretaceous sediments along a pre-existing tectonic structure in the Upper Oligocene (26 Ma). Later it was tectonically modified and intersected by the Labe River to form Mariánská hora Hill and Kamenný vrch Hill. The lacollith is formed by miaskitic natrolite sodalite phonolite passing into analcime sodalite phonolite in marginal parts of the body.
Ref.: Ulrych, J. et al. (2000): Tertiary phonolite laccolith of Mariánská hora hill, N. Bohemia: geological, petrological and mineralogical characteristics. Acta Montana IRSM AS CR, series A No. 15 (116), p. 5-44.
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Map Reference: 50°39'48"N , 14°3'15"E
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