Explore relationships

Late Devonian

Subdivision of the Devonian according to the ICS, as of 2024Vertical axis scale: Millions of years agoEtymologyName formalityFormalNickname(s)Age of FishesUsage informationCelestial bodyEarthRegional usageGlobal (ICS)Time scale(s) usedICS Time ScaleDefinitionChronological unitPeriodStratigraphic unitSystemTime span formalityFormalLower boundary definitionFAD of the GraptoliteLower boundary GSSPKlonk, Czech Republic49°51′18″N13°47′31″E / 49.8550°N 13.7920°E / 49.8550; 13.7920Lower GSSP ratified1972Upper boundary definitionFAD of the ConodontSiphonodella sulcata (discovered to have biostratigraphic issues as of 2006).Upper boundary GSSPLa Serre, Montagne Noire, France43°33′20″N3°21′26″E / 43.5555°N 3.3573°E / 43.5555; 3.3573Upper GSSP ratified1990Atmospheric and climatic dataSea level above present dayRelatively steady around 189 m, gradually falling to 120 m through periodThe Devonian ( ) is a geologic period and system of the Paleozoicera during the Phanerozoiceon, spanning 60.7 million years from the end of the preceding Silurian period at 419.62 million years ago (Ma), to the beginning of the succeeding Carboniferous period at 358.86 Ma.

Use + to expand a branch. Click a topic name to open its summary.