Geologic Time Scale

In which time period are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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

According to scientists, how long ago was the earth first formed?

• 4.5 billion years ago

• 600 million years ago

• 5 million years ago

What is the largest division of geologic time called?

• age

• eon

• era

• period

The Jurassic period is in the Paleozoic era.

• True

• False

Periods are divided into eras, and eras are divided into eons.

• True

• False

The standard method used to divide the Earth's long history into manageable parts

• relative age

• geologic time scale

• fossil record

• Permian extinction

Age of fish and amphibians

• extinction

• paleozoic era

• fossil record

• Precambrian era