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Input interpretation:

Jurassic Period  (geological time period)


Time range:

199.6 million to 145.5 million years ago (duration: 54.1 million years)


Geochronology:

eon | Phanerozoic Eon  (542 million to 0 years ago)\nera | Mesozoic Era  (251 million to 65.5 million years ago)\nsubdivisions | Early Jurassic Epoch  |  Middle Jurassic Epoch  |  Late Jurassic Epoch\nprevious period | Triassic Period  (251 million to 199.6 million years ago)\nnext period | Cretaceous Period  (145.5 million to 65.5 million years ago)


Starting event:

near first appearance of smooth ammonite group, Psiloceras planorbis


Ending events:

base of magnetic chronozone M18r  |  base of Calpionellid zone B  |  appearance of ammonite, Berriasella jacobi


Notable dinosaur families:

Abelisauroidea  |  Allosauridae  |  Anchisauridae  |  Ankylopollexia  |  Ankylosauridae  |  Avetheropoda  |  Brachiosauridae  |  Camarasauridae  |  Camptosauridae  |  Carnosauria  |  ...


Biological events:

Triassic-Jurassic extinction at the start of the period  |  dinosaurs increased in number  |  appearance of crocodiles  |  appearance of birds  |  conifers dominated the tree flora  |  ferns dominated the undergrowth  |  minor extinction at the end of the period


Geological events:

breakup of the supercontinent, Pangea into Gondwana and Laurasia began  |  Tethys Sea disappeared  |  Atlantic ocean began to open  |  Nevadan orogeny  |  Uralian orogeny  |  Cimmerian orogeny  |  Chonide orogeny  |  Andean orogeny

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