Geologic Time Scale: Basics Flashcards
What is the supereon?
Precambrian
what are the four eons following the precambrian, in order from oldest to most recent?
Hadean, Archean, Proterozoic, Phanerozoic
name the three Eras within the Phanerozoic from oldest to youngest
Paleozoic, Mesozoic, Cenozoic
Name the seven periods within the Paleozoic time scale from oldest to youngest
Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian
Name the three periods within the Mesozoic era, oldest to youngest
Triassic, Jurassic, Cretaceous
Name the two periods in the Cenozoic era, oldest to youngest
Tertiary, Quaternary
Name the five Tertiary period Epochs from oldest to newest
Paleocene, Eocene, Oligocene, Miocene, Pliocene
Name the two epochs in the Quaternary period
Pleistocene, Holocene
What two periods is the Tertiary Era broken up into?
Paleogene and Neogene
What does Paleozoic mean?
ancient animals
what does Mesozoic mean?
middle animals
what does Cenozoic mean?
recent animals
Cambrian Period
marine invertebrates emerge
Ordovician Period
primitive fish form, index fossil is the trilobite Cryptolithus
what are the two periods in the Age of Invertebrates?
Cambrian and Ordovician
what two periods are in the Age of Fishes?
Silurian and Devonian
Silurian Period
Early land animals emerge
Devonian Period
First forests and amphibians emerge, index fossils: mucrospirifer and phacops
what two periods make up the Age of Amphibians?
Carboniferous and Permian
what two periods are in the Carboniferous period?
Mississippian and Pennsylvanian
Mississippian Period
widespread shallow seas form
Pennsylvanian Period
coal bearing rocks form
Permian Period
earliest gymnosperms (cone bearing trees)
Mesozoic Era
Age of Reptiles, dinosaurs dominate