Čeština: Pohled na geologický profil Klonk s vyznačenou vrstvou č. 20
Deutsch: Blick auf den Aufschluss am Berg Klonk südwestlich von Prag, der das Referenzprofil für die Devon-Basis (GSSP) enthält. Die kleine weiße Markierung ungefähr in der Bildmitte kennzeichnet Schicht 20, anhand derer die Devon-Basis definiert ist.
English: View of the outcrop at Klonk hill which comprises the global boundary stratotype section and point (GSSP) of the base of the Devonian stage. The faint white marking in about the center of the picture indicates bed 20 which includes and defines the base of the Devonian stage.
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