Middle Devonian
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| Middle Devonian | |
|---|---|
Epoch | |
| Stratigraphic unit | Series |
| Time span formality | Formal |
| Lower boundary definition | Fad of the Conodont Polygnathus costatus partitus |
| Lower boundary GSSP | Wetteldorf Richtschnitt, Eifel hills, Germany 50°08′59″N 6°28′18″E / 50.1496°N 6.4716°E |
| Lower GSSP ratified | 1985 |
| Upper boundary definition | FAD of the Conodont Ancyrodella rotundibola |
| Upper boundary GSSP | Col du Puech de la Suque, Montagne Noire, France 43°30′12″N 3°05′12″E / 43.5032°N 3.0868°E |
| Upper GSSP ratified | 1986 |
In the
geological timescale, the Middle Devonian epoch (from 393.3 ± 1.2 million years ago to 382.7 ± 1.6 million years ago) occurred during the Devonian period, after the end of the Emsian
age.
The Middle Devonian epoch is subdivided into two stages: Eifelian and Givetian.
Life in the Middle Devonian
In the middle Devonian the armored jawless fish known as
Late Devonian
which are descendents of these early fish.
The earliest
cladoxylopsid trees including Calamophyton.[5]
The Taghanic event took place near the end of the Middle Devonian.
References
- doi:10.1086/421077.
- .
- .
- ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved December 16, 2024.
- doi:10.1144/jgs2023-204. Archived (PDF) from the original on 2024-03-09.)
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