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Early_Devonian
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Birth and death years unknown

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Early Devonian
419.62 ± 1.36 – 393.47 ± 0.99 Ma PreꞒ Ꞓ O S D C P T J K Pg N
A map of Earth as it appeared 405 million years ago during the Early Devonian Epoch, Emsian Age
Sample from the Lower Devonian Rhynie chert
Chronology
−420 — – −415 — – −410 — – −405 — – −400 — – −395 — – −390 — – −385 — – −380 — – −375 — – −370 — – −365 — – −360 — – Paleozoic Devonian C M Early Mid Late Early M Lochkovian Pragian Emsian Eifelian Givetian Frasnian Famennian S Přídolí     ← Hangenberg event, Famennian glaciation ← Kellwasser event (Late Devonian mass extinction) ← Widespread shrubs & trees ← Hunsrück fauna ← Rhynie chert Subdivision of the Devonian according to the ICS, as of 2024 Vertical axis scale: Millions of years ago
Etymology
Chronostratigraphic name	Lower Devonian
Geochronological name	Early Devonian
Name formality	Formal
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Epoch
Stratigraphic unit	Series
Time span formality	Formal
Lower boundary definition	FAD of the graptolite Monograptus uniformis
Lower boundary GSSP	Klonk, Czech Republic 49°51′18″N 13°47′31″E / 49.8550°N 13.7920°E / 49.8550; 13.7920
Lower GSSP ratified	1972
Upper boundary definition	FAD of the conodont Polygnathus costatus partitus
Upper boundary GSSP	Wetteldorf Richtschnitt section, Wetteldorf, Eifel, Germany 50°08′59″N 6°28′18″E / 50.1496°N 6.4716°E / 50.1496; 6.4716
Upper GSSP ratified	1985

Wikipedia Categories

• Devonian stubs
• Early Devonian
• Geological epochs
• Geochronology stubs
• Devonian geochronology

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