Statements (12)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
geological formation
|
| gptkbp:age |
419 million years ago
|
| gptkbp:definedIn |
first appearance of graptolite species Monograptus uniformis
|
| https://www.w3.org/2000/01/rdf-schema#label |
Silurian-Devonian boundary
|
| gptkbp:location |
gptkb:Klonk,_Czech_Republic
|
| gptkbp:marking |
beginning of Devonian period
end of Silurian period |
| gptkbp:recognizedBy |
gptkb:International_Commission_on_Stratigraphy
|
| gptkbp:separates |
gptkb:Silurian_period
gptkb:Devonian_period |
| gptkbp:bfsParent |
gptkb:Klonk,_Czech_Republic
|
| gptkbp:bfsLayer |
7
|