Jurassic
Sign in to saveThe Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period Ma (million years ago) to the beginning of the Cretaceous Period, 143.1 Ma. The Jurassic constitutes the second and middle period of the Mesozoic Era as well as the eighth period of the Phanerozoic Eon and is named after the Jura Mountains, where limestone strata from the period were first identified.
AI overview
The Jurassic is a geologic period that lasted from approximately 201 million years ago until 143.1 million years ago, making it the middle period of the Mesozoic Era. It is named after the Jura Mountains, where rocks from this time period were first scientifically identified and studied.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Geologic timespan.upper_gssp_candidates
- None
- Geologic timespan.color
- Jurassic
- Geologic timespan.time_start
- 201.4
- Geologic timespan.time_start_uncertainty
- 0.2
- Geologic timespan.time_end
- 143.1
- Geologic timespan.time_end_uncertainty
- 0.6
- Geologic timespan.image_map
- Mollweide Paleographic Map of Earth, 170 Ma (Bajocian Age).png
- Geologic timespan.caption_map
- A map of Earth as it appeared 170 million years ago during the Middle Jurassic Epoch
- Geologic timespan.timeline
- Jurassic
- Geologic timespan.name_formality
- Formal
- Geologic timespan.usage
- Global (ICS)
- Geologic timespan.timescales_used
Article
59 sectionsContents
- Etymology and history
- Geology
- Stratigraphy
- Early Jurassic
- Middle Jurassic
- Late Jurassic
- Mineral and hydrocarbon deposits
- Impact structures
- Paleogeography and tectonics
- Climate
- Climatic events
- Toarcian Oceanic Anoxic Event
- End-Jurassic transition
- Flora
- End-Triassic extinction
- Floral composition
- Conifers
- Ginkgoales
- Bennettitales
- Cycads
- Other seed plants
- Ferns and allies
- Lower plants
- Fauna
- Dinosaurs
- Theropods
- Birds
- Ornithischians
- Sauropodomorphs
- Other reptiles
- Crocodylomorphs
- Turtles
- Lepidosaurs
- Choristoderes
- Ichthyosaurs
- Plesiosaurs
- Pterosaurs
- Amphibians
- Mammaliaformes
- Fish
- Jawless fish
- Sarcopterygii
- Actinopterygii
- Chondrichthyes
- Insects and arachnids
- Marine invertebrates
- End-Triassic extinction
- Marine ecosystems
- Echinoderms
- Crustaceans
- Brachiopods
- Bryozoans
- Molluscs
- Gastropods
- Bivalves
- Cephalopods
- References
- Citations
- External links
The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period Ma (million years ago) to the beginning of the Cretaceous Period, 143.1 Ma. The Jurassic constitutes the second and middle period of the Mesozoic Era as well as the eighth period of the Phanerozoic Eon and is named after the Jura Mountains, where limestone strata from the period were first identified.
The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province (CAMP). The beginning of the Toarcian Age started around 183 Ma and is marked by the Toarcian Oceanic Anoxic Event, a global episode of oceanic anoxia, ocean acidification, and elevated global temperatures associated with extinctions, likely caused by the eruption of the Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear, definitive boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined.