Kirby Geologic Time Scale 2024

The Geologic Time Scale is a system used by geologists and other Earth scientists to describe the timing and relationships of events in Earth's history.

The four main eras are Precambrian, Paleozoic, Mesozoic, and Cenozoic.

Marine plants and invertebrates were abundant during the Paleozoic Era.

Humans first appeared during the Cenozoic Era.

Sedimentary rock is most commonly associated with the preservation of fossils.

Stromatolites are ancient bacteria that are among the oldest known life forms on Earth.

Stromatolites first appeared in the Precambrian Era.

We are currently living in the Cenozoic Era.

The Precambrian Era is significant because it covers the majority of Earth's history and includes the formation of the Earth and the first simple life forms.

The Mesozoic Era is known for the age of dinosaurs and the emergence of mammals and birds.