is a predated era prior to the emergence of life during the Cambrian Period.

Geoligic time scale during Precambrian era

Earth’s surface was in the form of liquid rock and boiling sulfur that built an ocean of hot materials.

Earth’s interior was still hot and active and this caused a series of volcanic eruptions. This formed long chains of small islands. The continents have not formed yet during this time.

Earth was suspected to have two supercontinents: one was located in the equator and the other one was situated on the other side.

At the start of this era, the world-continent ___ was broken into pieces leading to the formation of ___ that makes Earth's continents connected once again.

This era is mainly characterized by the explosion of different life forms that started to emerge on Earth.

The Paleozoic is divided into six periods:

It is also known as the Age of Fishes.

First seed plants and first reptiles appeared.

It is marked by the extinction of 90% of Earth’s species.

appeared in the fossil record that was dated almost 600 million years ago.

One of the important Ediacarans was the ___, which resembles a ribbed doormat.

Vertebrates first appeared 525 million years ago during the

were the dominant species during the Cambrian period. These organisms are extinct groups of arthropods.

The Silurian to the Permian period was dominated by

The Precambrian Era has three major subdivisions:

Most phyla of the modern times were present during the Cambrian but _ , _ , _ , _ , _ were the most abundant

famous for the presence of dinosaurs.

___ termed as the age of the dinosaurs which lasted for almost __ million years that spans from an estimated ___ to ___ million years.

The Mesozoic era has three major periods, namely, the

The climate remained similar to that of the Jurassic period, warm and humid.

The environment evolved to the point that flowering plants (angiosperms) began to appear for the first time.

During the Mesozoic era, dinosaurs evolved, specifically at the end of what period

started with a large extinction that took around 208 - 200 million years ago. The Pangaea separated significantly that may have caused the mass extinction related to volcanic activities due to the movement of the continental plates. These events allowed the dinosaurs to rule the planet.

started around 251 million years ago. It lasted for around 50 million years. The ___ period involved two large extinction events, where dinosaurs were not yet diverse as it would become later in the Jurassic period.

started approximately 144 million years ago. It can be directly translated as "chalk" that is based on its abundant chalk deposits. This period also marks the end of the dinosaur age due to the ___

considered as the most recent of the major subdivisions of animal history within Earth’s geologic time scale.

Some of the scientists also referred to Cenozoic as the ____ since this time is highly dominated by large mammals.

started from the extinction of the dinosaurs (65 million years ago) to the start of the Neogene Period (23 million years ago).

This time scale (Paleogene Period) includes three epochs:

lasted from 23 million to about 2.6 million years ago. It can be further subdivided into two epochs: the Miocene and Pliocene epochs.

The ___ or also known as the ___ period began about 2.6 million years ago and continues today. It is subdivided into two epochs: the Pleistocene and Holocene epochs.

are the shortest subdivision unit in the Earth’s geologic time scale that is characterized by the changes in life forms and may vary from continent to continent.

reflects the entire geological history of our planet.

The geologic time scale is divided into

means ‘visible life’ that was constructed through rock units that bear abundant fossils.

represents the period between the birth of the planet and the appearance of life forms.

This refers to a system of dating the history of Earth in a chronological manner using geological data.

Age of Invertebrates

Age of Reptiles

Age of Mammals

Precambrian Era is divided into 3

Cenozoic Era is divided into 2 periods

extinction of dinosaurs, first primates, first flowering plants

first birds, dinosaurs diversity

first mammals, first dinosaurs

first appeared 525 million years ago during the Cambrian Explosion

Mesozoic Era which is termed as the age of dinosaurs lasted for

Land masses are still intact

Cretaceous period marks the end of dinosaur age due to the

Quaternary is also known as

Quaternary also known as Anthropogene is divided into two epochs

Neogene period can be further divided into two epochs

are the longest subdivision unit in the Earth’s geologic time scale