GTS

Geologic Time Record

is a tabular representation of the major divisions of the Earth's history. The time intervals are divided and described from the longest to the shortest as EONS, ERAS, PERIODS and EPOCHS.

CAMBRIAN EXPLOSION

is the belief that there was a sudden, apparent explosion of diversity in life forms about 545 million years ago. The explosion created the complexity of multi-celled organisms in a relatively short time frame of 5 to 10 million years. This explosion also created most of the major extant animal groups today.

Phanerozoic Eon

is the most recent eon and began more than 500 million years ago.

Era

Eons are divided into smaller time intervals known as

Periods

Eras are subdivided into ______. events that bound the periods are widespread in their extent but are not as significant as those which bound the eras.

Epochs

Finer subdivision of time are possible, and the periods of the Cenozoic are frequently subdivided into

Cenozoic, Mesozoic, Paleozoic

In the time scale, Phanerozoic is divided into three eras:

Geologic Time Scale

Is a system of chronological dating relates geological strata to time.

Geologic Time Scale

It is used by geologists, paleontologists, and other earth scientist to describe the timing and relationships of events that have occurred during earth's history.

Permian, Pennsylvanian, Mississippian, Devonian, Silurian, Ordovician and Cambrian periods

Paleozoic is subdivided into the

Hadean, Archean, Proterozoic and Phanerozoic

The Geologic time is divided into four large segments called Eons:

oldest, youngest

The earth carries the history of geological events in its rock layers. It follows that the _________ layers are at the bottom and the _________ are at the top,

radiometric dating

The relative geologic time scale developed from fossil record has been numerically quantified by means of absolute dates obtained with _________

EONS, ERAS, PERIODS and EPOCHS

The time intervals are divided and described from the longest to the shortest as

Eons

Are the largest intervals of geologic time and are hundreds of millions of years in duration.

geologic record

Because living things have undergone evolutionary changes over geologic time, particular kinds of organisms are characteristic by particular parts of the _____

Anthropocene

defines earth's most recent geologic time period as being human-influenced. Unofficial interval of geologic time, making up the third world wide division of the quaternary period((2.6million years ago to the present), characterized as the time in which the collective activities of human beings.