Which is older Jurassic or Triassic?
From oldest to youngest: Triassic (251.902 to 201.3 million years ago) Jurassic (201.3 to 145 million years ago) Cretaceous (145 to 66 million years ago)
What is the Triassic Jurassic and Cretaceous periods?
The Triassic period, from 252 million to 200 million years ago, saw the rise of reptiles and the first dinosaurs. The Jurassic period, from about 200 million to 145 million years ago, ushered in birds and mammals. Flowering plants emerged during the late Cretaceous period.
What happened during Triassic Jurassic period?
end-Triassic extinction, also called Triassic-Jurassic extinction, global extinction event occurring at the end of the Triassic Period (about 252 million to 201 million years ago) that resulted in the demise of some 76 percent of all marine and terrestrial species and about 20 percent of all taxonomic families.
What period came after the dinosaurs?
Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. The Cretaceous began 145.0 million years ago and ended 66 million years ago; it followed the Jurassic Period and was succeeded by the Paleogene Period (the first of the two periods into which the Tertiary Period was divided).
How many dinosaur periods were there?
three periods
The ‘Age of Dinosaurs’ (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.
Why is it called Triassic period?
The Triassic was named in 1834 by Friedrich von Alberti, after a succession of three distinct rock layers (Greek triás meaning ‘triad’) that are widespread in southern Germany: the lower Buntsandstein (colourful sandstone), the middle Muschelkalk (shell-bearing limestone) and the upper Keuper (coloured clay).
What are the 3 dinosaur periods?
The ‘Age of Dinosaurs’ (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.
What are the different Jurassic periods?
Geology. The Jurassic Period is divided into three epochs: Early, Middle, and Late.
What caused the Jurassic Cretaceous extinction?
Many scientists believe that the collision of a large asteroid or comet nucleus with Earth triggered the mass extinction of the dinosaurs and many other species near the end of the Cretaceous Period.
What caused the Jurassic period to end?
Events marking the beginning and end of the Jurassic period This dinosaur extinction was paralleled by a shift in dominate vegetation from the conifers and cycads of the Jurassic period to shorter, primitive flowering trees (346).
How long ago was the Jurassic period?
201.3 (+/- 0.2) million years ago – 145 million years ago / Occurred
Did T Rex live in Jurassic period?
tyrannosaur, any of a group of predatory dinosaurs that lived from the late Jurassic Period (about 150 million years ago) to the latest Cretaceous Period (about 65 million years ago), at which time they reached their greatest dominance. The best-known and largest member of the group is Tyrannosaurus rex, or T. rex.