Jurassic
E6158
Jurassic is a geologic period of the Mesozoic Era known for its abundant dinosaurs and the breakup of the supercontinent Pangaea.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| Jurassic–Cretaceous boundary | 1 |
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic unit
ⓘ
geologic period ⓘ |
| biostratigraphicMarker |
ammonites
ⓘ
foraminifera ⓘ |
| characterizedBy |
abundant dinosaurs
ⓘ
ammonite diversification ⓘ breakup of Pangaea ⓘ coal formation in some regions ⓘ conifer forests ⓘ diverse marine reptiles ⓘ early bird evolution ⓘ extensive shallow epicontinental seas ⓘ gymnosperm-dominated floras ⓘ high sea levels ⓘ warm global climate ⓘ |
| climate | generally humid and warm ⓘ |
| contains |
important petroleum source rocks in some basins
ⓘ
major limestone deposits ⓘ significant marine shale sequences ⓘ |
| duration | about 56 million years ⓘ |
| end | approximately 145 million years ago ⓘ |
| followedBy | Cretaceous ⓘ |
| follows | Triassic ⓘ |
| globalBoundaryDefinition | base defined near first appearance of Psiloceras spelae ammonites ⓘ |
| importantFossilGroup |
early mammals
ⓘ
marine ichthyosaurs ⓘ plesiosaurs ⓘ pterosaurs ⓘ sauropod dinosaurs ⓘ stegosaurs ⓘ theropod dinosaurs ⓘ |
| majorTectonicEvent |
initial breakup of Pangaea
ⓘ
opening of the Central Atlantic Ocean ⓘ rifting between Laurasia and Gondwana ⓘ |
| nameCoinedBy | Alexandre Brongniart ⓘ |
| namedAfter | Jura Mountains ⓘ |
| oceanChemistry | well-oxygenated shallow seas ⓘ |
| paleogeography | dominance of large continents and broad seaways ⓘ |
| partOf | Mesozoic Era ⓘ |
| positionInEon | Phanerozoic Eon ⓘ |
| positionInEra | middle period of the Mesozoic Era ⓘ |
| precededBy | Triassic ⓘ |
| precedes | Cretaceous ⓘ |
| start | approximately 201.3 million years ago ⓘ |
| subdividedInto |
Early Jurassic
ⓘ
Late Jurassic ⓘ Middle Jurassic ⓘ |
| usedIn |
geologic time scale
ⓘ
stratigraphic correlation ⓘ |
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Jurassic–Cretaceous boundary