Late Jurassic
E53042
The Late Jurassic was the final epoch of the Jurassic Period, marked by warm climates, high sea levels, and the flourishing of large dinosaurs and early birds.
Observed surface forms (1)
| Surface form | As subject | As object |
|---|---|---|
| Upper Jurassic | 0 | 1 |
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf | geologic epoch → |
| atmosphere |
elevated atmospheric carbon dioxide
→
high atmospheric oxygen compared to present → |
| boundaryDefinition |
base defined by first appearance of ammonite Cardioceras redcliffense (Oxfordian GSSP)
→
top approximated near major biotic and geochemical changes at Jurassic–Cretaceous transition → |
| characterizedBy |
abundant marine reptiles
→
diverse dinosaur faunas → early birds → large sauropod dinosaurs → large theropod dinosaurs → reef‑building corals → rich ammonite faunas → |
| climate |
generally warm
→
largely ice‑free poles → |
| endTime | approximately 145 million years ago → |
| flora |
conifer‑dominated forests
→
cycads and bennettitaleans → ginkgophytes → |
| follows | Middle Jurassic → |
| includesStage |
Kimmeridgian
→
Oxfordian → Tithonian → |
| marineLife |
ammonites
→
belemnites → ichthyosaurs → marine crocodile relatives → plesiosaurs → |
| notableFossilSite |
Kimmeridge
→
surface form: "Kimmeridge Clay"
Morrison Formation → Portland stone →
surface form: "Portland Stone"
Solnhofen Limestone → Tendaguru Formation → |
| notableTaxon |
Allosaurus
→
Apatosaurus → Archaeopteryx lithographica →
surface form: "Archaeopteryx"
Brachiosaurus → Camarasaurus → Ceratosaurus → Diplodocus → Stegosaurus → |
| oceanCoverage | extensive shallow epicontinental seas → |
| paleogeography |
large continental landmasses at lower latitudes
→
widespread carbonate platforms → |
| partOf | Jurassic Period → |
| precedes |
Cretaceous
→
surface form: "Early Cretaceous"
|
| seaLevel | high global sea levels → |
| startTime | approximately 163.5 million years ago → |
| stratotypeRegion | Europe → |
| subdivisionOf | Mesozoic Era → |
| tectonics |
continued breakup of Pangaea
→
opening of the North Atlantic Ocean → separation of Laurasia and Gondwana progressing → |
| timeSpan | about 18.5 million years → |
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form: "Upper Jurassic"