Early Jurassic
First epoch of the Jurassic Period / From Wikipedia, the free encyclopedia
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The Early Jurassic Epoch (in chronostratigraphy corresponding to the Lower Jurassic Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-Jurassic extinction event, 201.3 Ma (million years ago), and ends at the start of the Middle Jurassic 174.7 ±0.8 Ma.
First epoch of the Jurassic Period
| Early/Lower Jurassic | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 201.3 ± 0.2 – 174.7 ± 0.8 Ma | |||||||||
| Chronology | |||||||||
| |||||||||
| Etymology | |||||||||
| Chronostratigraphic name | Lower Jurassic | ||||||||
| Geochronological name | Early Jurassic | ||||||||
| 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 Ammonite Psiloceras spelae tirolicum. | ||||||||
| Lower boundary GSSP | Kuhjoch section, Karwendel mountains, Northern Calcareous Alps, Austria 47.4839°N 11.5306°E / 47.4839; 11.5306 | ||||||||
| Lower GSSP ratified | 2010[2] | ||||||||
| Upper boundary definition | FAD of the Ammonites Leioceras opalinum and Leioceras lineatum | ||||||||
| Upper boundary GSSP | Fuentelsaz, Spain 41.1708°N 1.8333°W / 41.1708; -1.8333 | ||||||||
| Upper GSSP ratified | 2000[3] | ||||||||
Certain rocks of marine origin of this age in Europe are called "Lias" and that name was used for the period, as well, in 19th-century geology.[4] In southern Germany rocks of this age are called Black Jurassic.