Geologic Time Scale Review

Front

What is the Mesozoic Era?

Back

The Mesozoic Era is a geological time period that lasted from about 252 to 66 million years ago, known as the age of reptiles, including dinosaurs.

Front

In which Eon is the Mesozoic Era found?

Back

The Mesozoic Era is found in the Phanerozoic Eon.

Front

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

Back

Absolute age tells us the 'exact' age of a fossil determined by radiometric dating.

Front

What is the current geological period we are in?

Back

We are currently in the Quaternary period.

Front

What is the most recent era that we are currently in?

Back

The most recent era we are currently in is the Cenozoic Era.

Front

What is a mass extinction?

Back

A mass extinction is the end of an era, marked by the extinction of a large number of species in a relatively short period of time.

Front

What is the significance of the Phanerozoic Eon?

Back

The Phanerozoic Eon is significant because it encompasses the time during which abundant animal and plant life has existed.

Front

What are the three eras of the Phanerozoic Eon?

Back

The three eras of the Phanerozoic Eon are Paleozoic, Mesozoic, and Cenozoic.

Front

What is radiometric dating?

Back

Radiometric dating is a method used to determine the age of rocks and fossils by measuring the decay of radioactive isotopes.

Front

What is the difference between relative age and absolute age?

Back

Relative age is the age of a rock or fossil in comparison to other rocks or fossils, while absolute age is the exact age determined by methods like radiometric dating.