Geologic time Scale

In which time period are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

In what time period did Pangaea, the super continent, appear?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

• Preserved fossils

• Index fossils

• Imprints

• Radioactive dating

Preserved remains of plants and animals from the remote past are called?

• Sedimentary rocks

• Radioactive dating

• Decayed organisms

• Fossils

The Law of Superposition states

• Younger rocks layers are on top of older rock layers

• Fossils are found in sedimentary rocks

• Older rock layers are on top of younger rock layers

• Absolute age dating

Which era was the longest, taking up 88% of geologic time?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What does absolute age tell us about a rock layer or fossil?

• The 'exact' age of a fossil determined by radiometric dating

• The relative age of a fossil determined by radiometric dating

• Younger rock layers sit on top of older rock layers

• Older rock layers sit on top of younger rock layers

The end of an era, and the end of life for groups of organisms, is called?

• Death

• Mass extinction

• Transition

• Turning point