Early Jurassic
E38609
The Early Jurassic was the first epoch of the Jurassic Period, marked by the recovery of life after the end-Triassic extinction and the early diversification of dinosaurs and marine reptiles.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
geologic epoch
ⓘ
subdivision of the Jurassic Period ⓘ |
| associatedWith |
initial breakup of Pangaea
ⓘ
intense volcanic activity in large igneous provinces ⓘ opening of the Central Atlantic Ocean ⓘ |
| beganAfter | end-Triassic mass extinction ⓘ |
| carbonDioxideLevel | higher than present atmospheric level ⓘ |
| characterizedBy |
diversification of marine reptiles
ⓘ
dominance of gymnosperm floras ⓘ early diversification of dinosaurs ⓘ expansion of ammonites ⓘ high sea levels ⓘ radiation of bivalves ⓘ recovery of marine ecosystems ⓘ recovery of terrestrial ecosystems ⓘ warm greenhouse climate ⓘ widespread shallow epicontinental seas ⓘ |
| climate | generally warm and humid ⓘ |
| contains |
Hettangian
ⓘ
Pliensbachian ⓘ Sinemurian ⓘ Toarcian ⓘ |
| duration | about 27 million years ⓘ |
| endTime | approximately 174.1 million years ago ⓘ |
| firstStage | Hettangian ⓘ |
| floraIncludes |
conifers
ⓘ
cycads ⓘ ginkgophytes ⓘ seed ferns ⓘ |
| follows |
Late Triassic
ⓘ
Rhaetian Age ⓘ |
| includesEvent | Toarcian Oceanic Anoxic Event ⓘ |
| lastStage | Toarcian ⓘ |
| marineFaunaIncludes |
ammonites
ⓘ
belemnites ⓘ brachiopods ⓘ ichthyosaurs ⓘ plesiosaurs ⓘ |
| oxygenLevel | near or slightly below present atmospheric level ⓘ |
| partOf | Jurassic Period ⓘ |
| precedes | Middle Jurassic ⓘ |
| recognizedBy | International Commission on Stratigraphy ⓘ |
| startTime | approximately 201.3 million years ago ⓘ |
| stratotypeDefinedBy | Global Boundary Stratotype Section and Point for base of Hettangian ⓘ |
| terrestrialFaunaIncludes |
early mammals
ⓘ
early sauropod dinosaurs ⓘ ornithischian dinosaurs ⓘ pterosaurs ⓘ theropod dinosaurs ⓘ |
| usedIn | geologic time scale ⓘ |
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.