Q3: History of Life on Earth II - Mesozoic and Cenozoic Era Flashcards
This era is known as ‘Middle Life’, started more than 252 mil. yrs. ago and lasted until 66 mil. yrs. ago.
mesozoic era
Three geological periods of the mesozoic
- triassic
- jurassic
- cretaceous
The mesozoic era is considered as the Age of ____________ and Age of ____________.
- Dinosaurs
- Conifers
Which group of organisms dominated the triassic period?
- therapsids
- thecodonts
They are sometimes referred to as “mammal-like reptiles.”
therapsids
The ancestors of dinosaurs and crocodiles, together with lizards, turtles, flying pterosaurs, and the first true mammals.
thecodonts
These organisms became a dominant group in the triassic period.
mollusks
In which period did fishes, sharks, and marine reptiles such as plesiosaurs, nothosaurs, and ichthyosaurs started to swim in the seas.
triassic period
Which period did feathered dinosaurs first appear?
jurrasic period
These organisms dominated the jurassic period.
- sauropods
- theropods
This period is when the first true coral was formed.
jurassic period
Which plant dominated the jurrassic period?
cycads
These jurassic animals were characterized by their long necks and tails.
sauropods
These jurassic organisms are bipedal carnivorous dinosaurs.
theropods
In this period, which lasted from 144 mil. yrs. ago until 65 mil. yrs. ago, the terrestrial environment was dominated by the dinosaurs.
cretaceous period
Which period did flowering trees and placental mammals appeared?
cretaceous period
Types of dinosaurs during the cretaceous period
- duck-billed Hadrosaurs
- horned ceratopsians
It is known as ‘Recent Life’, started more than 66 mil. yrs. ago and is continuing today.
cenozoic era
It is considered as the Age of Birds and Mammals.
cenozoic era
2 geological periods of the cenozoic era
paleogene
neogene
7 geological epochs of the cenozoic era
- paleocene
- eocene
- oligocene
- miocene
- pliocene
- pleistocene
- holocene
5 mass extinction
- Ordovician-Silurian Extinction
- Devonian Extinction
- Permian-Triassic Extinction
- Triassic-Jurassic Extinction
- Cretaceous-tertiary Extinction
This event took place 200 million years ago, eliminating about 80% of Earth’s species, including many types of dinosaurs.
Triassic Mass Extinction
The probable cause of the triassic mass extinction which have brought increased carbon dioxide levels and global temperatures, as well as ocean acidification.
colossal geological activity
This event occurred 65 million years ago, killing 78% of all species, including the remaining non-avian dinosaurs.
Cretaceous mass extinction
The most likely cause of the cretaceous mass extinction.
asteroid hitting the Earth
Triassic, Jurassic, or Cretaceous
therapsids
Triassic
Triassic, Jurassic, or Cretaceous
thecodonts
Triassic
Triassic, Jurassic, or Cretaceous
Sauropods
Jurrasic
Triassic, Jurassic, or Cretaceous
Theropods
Jurassic
Triassic, Jurassic, or Cretaceous
Feathered dinosaur
Jurassic
Triassic, Jurassic, or Cretaceous
first true coral
Jurassic
Triassic, Jurassic, or Cretaceous
Tyrannosaurus rex
Cretaceous
Triassic, Jurassic, or Cretaceous
flowering trees
cretaceous
catlike and doglike animals
creodonts
the first horse
eohippus
odd-toed ungulates
Perissodactyls
even-toed ungulates
Artiodactyls
humanlike apes
Dryopithecines
First hominids
australopithecines
what epoch did the ice age began?
Pliocene
This epoch is sometimes referred to as the “Great Ice Age” because of the extensive glaciation that occurred during this time.
Pleistocene
