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Middle Jurassic | |||||||||
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Chronology | |||||||||
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Etymology | |||||||||
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 Ammonites Leioceras opalinum and Leioceras lineatum | ||||||||
Lower boundary GSSP | Fuentelsaz, Spain 41°10′15″N 1°50′00″W / 41.1708°N 1.8333°W | ||||||||
Lower GSSP ratified | 2000[2] | ||||||||
Upper boundary definition | Not formally defined | ||||||||
Upper boundary definition candidates | Horizon of Ammonite Cardioceras redcliffense. | ||||||||
Upper boundary GSSP candidate section(s) |
The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 161.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare,[3] but geological formations containing land animal fossils include the Forest Marble Formation in England, the Kilmaluag Formation in Scotland,[4] the Calcaire de Caen of France,[5] the Daohugou Beds in China, the Itat Formation in Russia, the Tiouraren Formation of Niger,[6] and the Isalo III Formation of western Madagascar.
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