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.

All labels observed (4)

Label Occurrences
Early Jurassic canonical 10
Lower Jurassic Series 3
Lower Jurassic series 2

How this entity was disambiguated

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

How these facts were elicited

Referenced by (16)

Full triples — surface form annotated when it differs from this entity's canonical label.

Jurassic subdividedInto Early Jurassic
Jurassic Period subdividedInto Early Jurassic
Watchung Mountains geologicalPeriod Early Jurassic
breakup of Gondwana startTime Early Jurassic
New Jersey Palisades geologicalAge Early Jurassic
Tetanurae timeOfFirstAppearance Early Jurassic
Late Triassic precedes Early Jurassic
Pliensbachian partOf Early Jurassic
Pliensbachian subdivisionOf Early Jurassic
this entity surface form: Lower Jurassic Series
Toarcian Oceanic Anoxic Event partOf Early Jurassic
Global Boundary Stratotype Section and Point for base of Hettangian marksBaseOf Early Jurassic
this entity surface form: Lower Jurassic Series
Toarcian partOf Early Jurassic
Toarcian partOf Early Jurassic
this entity surface form: Lower Jurassic Series
Hettangian stage partOf Early Jurassic
this entity surface form: Early Jurassic epoch
Hettangian stage partOf Early Jurassic
this entity surface form: Lower Jurassic series
Hettangian stage startOf Early Jurassic
this entity surface form: Lower Jurassic series