Geologic Time

Which best describes the geologic time scale?

• It explains why events happen throughout Earth’s history.

• It presents the correct sequence of events in Earth’s history.

• It is used to determine the absolute dates in years for different period

• It was created by scientists who studied index fossils and climate change.

Study the geolo The Eocene period exists in Earth’s history around 34 MYA.

What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale? gic time scale.

• learn what happened during Precambrian time

• study information related to the Cenozoic era

• view the timing of events in the Mesozoic era

• research events that happened during the Paleozoic era

The table shows index fossils.

Which conclusion about Paradoxides pinus is supported by the information in the table? ssils.

• Life forms existed during the Cambrian period.

• Similar fossil species formed after the Devonian period.

• This fossil species first appeared during the Cenozoic era.

• Different life forms were surviving during Precambrian time.

What does the geologic time scale confirm about the Cretaceous period?

• It ended during the Cenozoic era

• It ended during the Mesozoic era.

• It started before Precambrian time.

• It started before the Cambrian period.

What information does the geologic time scale provide?

• explanation of how Earth formed

• places where dinosaurs roamed on Earth

• reasons why organisms evolve into different species

• information about when plants first appeared

Study the image.

Which describes the geological time of the first land plants?

• Conifers appeared after the first flowering plants.

• Conifers first appeared around 182 million years ago.

• The first flowering plants appeared around 240 million years ago.

• The first flowering plants were introduced toward the end of the Mesozoic era.

Study the image about geologic time.

During which period did humans first appear on Earth?

• Quaternary

• Neogene

• Paleogene

• Cenozoic

Study this image of a geologic time scale.

How long ago did invertebrates become common on Earth?

• 1.6 million years ago

• 132 million years ago

• 410 million years ago

• 520 million years ago

Which unit of geologic time began 65.5 million years ago and continues to the present?

• Cenozoic era

• Mesozoic era

• Permian period

• Precambrian time

Which unit of geologic time is the oldest?

• Cenozoic

• Mesozoic

• Ordovician

• Precambrian