page_title: Klonk
section_title: Flora and fauna
hierarchical_section_title: Klonk / Flora and fauna
caption_attribution_description: 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.
context_page_description: Klonk is a Czech national nature monument within the landscape park Český kras which lies in the northern part of the village of Suchomasty, approximately 12 kilometres from Beroun. It is globally recognized as a geologically important location due to the presence of the Global Boundary Stratotype Section and Point marking the boundary between Silurian and Devonian periods. The boundary was set based on the first appearance of the graptolite Monograptus uniformis in the bed number 20. The stratotype was ratified on the 8th of February 1972 by the International Union of Geological Sciences in Montreal as the first formally accepted GSSP.
context_section_description: Various plant communities can be found at Klonk. The vicinity of the brook is characterized by human planted vegetation, for example the common alder (Alnus glutinosa), European ash (Fraxinus excelsior) or Canadian poplar (Populus x canadensis), in the lower parts of the slope are the remains of scree forests with dominant sycamore. Shady limestones by the brook are a favourable location for a number of rare bryophytes, such as the craven featherwort (Pedinophyllum interruptum) or beech feather-moss (Eurhynchium crassinervum).
  Most of the slope is covered by vegetation which is not native to the location – black pine (Pinus nigra), European larch (Larix decidua), black locust (Robinia pseudoaccacia) and Norway spruce (Picea abies). The original community of oak-hornbeam forests (Sessile oak (Quercus petraea), common hornbeam (Carpinus betulus), field maple (Acer campestre)) can only be found in the upper parts of the profile. The formerly woodless areas tend to be covered by bushes of dog-rose (Rosa canina), blackthorn (Prunus spinosa) and common dogwood (Cornus sanguinea), atop the hill we may find an area of xerothermic grasslands such as spotted knapweed (Centaurea stoebe) and hairy oxytropis (Oxytropis pilosa).
  Klonk is the nesting place for a number of birds, among others the grey wagtail (Motacilla cinerea), Eurasian sparrowhawk (Accipited nisus) or the common buzzard (Buteo buteo). Most of the fauna here is represented by invertebrates, however apart from other areas of the Bohemian karst it is somewhat poorer in molluscs. Vertebrate fauna is represented by red fox (Vulpes vulpes), European badger (Meles meles), wood mouse (Apodemus sylvaticus) and other, usually common species.
caption: Geological profile with highlighted bed no. 20
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