A new international stratotype in the Paleozoic of the Barrandian area

The International Commission on Stratigraphy IUGS, through its plenary power, has designated the fourth Global Stratotype Section and Point (GSSP) in the Lower Paleozoic of the Barrandian area. On December 27, 2023, the Commission selected the black shale succession of the Želkovice Formation near Hlásná Třebaň as the international stratotype for the lower Silurian Aeronian Stage. This decision resulted from the extensive study, description, and proposal by an international research team led by Petr Štorch of the Institute of Geology of the Czech Academy of Sciences. Together with the existing Devonian base stratotype at Klonk near Suchomasty, the Pragian base stratotype at Velká Chuchle and the Přídolí base stratotype at the Požáry Quarry near Řeporyje, the Hlásná Třebaň section poses an unparalleled concentration of global stratotype sections worldwide.