During this period Earth was flowing with lava, the core was unstable, and was the first Era of the Precambrian Eon.

During what Period were Dinosaurs present?

The age of marine life.

The Age of Mammals

In which time period are we currently living?

The Age of Fishes

The _________ was the period of giant hard-shelled creatures: arthropods, insects and marine invertebrates.

What are the four eras in order from OLDEST to NEWEST?

What era did trilobites, fishes, and other marine organisms dominate?

What is the current eon we are in?

What is the smallest time increment in the geologic time scale?

The Paleozoic era started with a Cambrian explosion.

Which era is considered as the "Age of Reptiles"