Geological Time Scale
What DOES the Geologic Time Scale (GTS) represent?
A. A map of Earth's continents
B. A calendar of events in Earth's history
C. A record of daily weather changes
D. A classification of rocks
B. A calendar of events in Earth's history
Which eon includes the Paleozoic, Mesozoic, and Cenozoic eras?
Phanerozoic
During which era did dinosaurs first appear?
Mesozoic
During which period did Pangaea begin to break apart?
A. Permian Period
B. Triassic Period
C. Jurassic Period
D. Cretaceous Period
B. Triassic Period
During which epoch do we live today?
A. Pleistocene Epoch
B. Holocene Epoch
C. Pliocene Epoch
D. Miocene Epoch
B. Holocene Epoch
Which is the LARGEST officially defined unit of geological time?
A. Eon C. Epoch
B. Period D. Era
A. Eon
During which eon did oxygen begin to accumulate significantly in Earth's atmosphere?
Proterozoic
Which era is known as the Age of Reptiles?
Mesozoic
During which period did the first reptiles appear?
A. Devonian Period
B. Triassic Period
C. Permian Period
D. Carboniferous Period
D. Carboniferous Period
During which epoch did the primates mentioned in the textbook first appear?
A. Oligocene Epoch
B. Eocene Epoch
C. Paleocene Epoch
D. Miocene Epoch
A. Oligocene Epoch
Which sequence CORRECTLY shows the geological time units from largest to smallest?
A. Eon → Era → Period → Epoch
B. Era → Eon → Epoch → Period
C. Period → Era → Eon → Epoch
D. Epoch → Period → Era → Eon
A. Eon → Era → Period → Epoch
Which eon includes the Hadean, Archean, and Proterozoic?
Precambrian
During which era did humans appear?
Cenozoic
During which period did angiosperms (flowering plants) become dominant in many terrestrial ecosystems?
A. Jurassic Period
B. Cretaceous Period
C. Paleogene Period
D. Neogene Period
C. Paleogene Period
During which epoch did the most recent ice ages occur?
Pleistocene Epoch
A subdivision of an eon in the Geologic Time Scale.
Era
The origin of Earth; Formation of the Moon
Hadean
Which era is known for the extinction of the dinosaurs at its end?
Mesozoic
During which period did the largest mass extinction in Earth's history occur?
Permian Period
During which epoch did early bipedal human ancestors, such as Australopithecus, appear?
A. Eocene Epoch
B. Oligocene Epoch
C. Miocene Epoch
D. Pliocene Epoch
D. Pliocene Epoch
A smaller unit into which periods can be subdivided.
Epoch
The first appearance of reptiles (which evolved from amphibians) and ferns.
Phanerozoic
During which era did the first fish appear?
Paleozoic
During which period did the first modern humans appear?
Quaternary Period
What is the approximate age of the Earth?
4.6 billion years