Klonk

(from the article `Silurian Period`) ...and trilobite taxa) as the base of the Devonian System. The top of the Silurian System is constrained by this golden spike, which has its ...
Found on http://www.britannica.com/eb/a-z/k/40

Klonk

Klonk, southwest of Prague, Czech Republic, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the Devonian and Silurian periods on the geologic time scale. Klonk was the first formally agreed upon GSSP, having been ratified by the International Union of Geological Sciences in 1972. The boun...
Found on http://en.wikipedia.org/wiki/Klonk
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