What Are The 4 Eons?

Which EON has the most life?

Phanerozoic EonThe Phanerozoic Eon is the current geologic eon in the geologic time scale, and the one during which abundant animal and plant life has existed.

It covers 541 million years to the present, and it began with the Cambrian Period when animals first developed hard shells preserved in the fossil record..

What era do we live in 2020?

Holocene eraThe present year, 2020, can be transformed into a Holocene year by adding the digit “1” before it, making it 12,020 HE. Years BC/BCE are converted by subtracting the BC/BCE year number from 10,001. Beginning of the Meghalayan age, the current and latest of the three stages in the Holocene era.

Which EON did life first?

It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils. In fact, all life during the more than one billion years of the Archean was bacterial.

Is an eon longer than an era?

Vocabulary: eon = The largest unit of time. era = A unit of time shorter than an eon but longer than a period. period = A unit of time shorter than an era but longer than epoch.

Which era do we live in?

CenozoicOur current era is the Cenozoic, which is itself broken down into three periods. We live in the most recent period, the Quaternary, which is then broken down into two epochs: the current Holocene, and the previous Pleistocene, which ended 11,700 years ago.

Which era is the oldest?

Paleozoic EraThe Paleozoic Era is the oldest of the three Eras and dates from 540 Million to 248 Million Years Ago. During the Paleozoic Era multicelled living things acquired hard body parts, bones, vertebral columns, mandibles, and teeth.

What’s bigger than an eon?

A supereon is longer than an eon.

What is the youngest Eon?

CenozoicThe Phanerozoic Eon is divided into three eras, the Paleozoic, Mesozoic and Cenozoic eras. These were named for the kinds of fossils that were present. The Cenozoic is the youngest era and the name means “new life”.

How long is an eon?

one billion yearsLess formally, eon often refers to a span of one billion years.

What is more than a millennia?

There is a megaannum (Ma) which is one million years. There is a gigaannum (Ga) which is one billion years. There is a teraannum (Ta) which is equal to one trillion years.

What age are most of the Earth’s cratons?

2 billion yearsSome are over 2 billion years old. Cratons are generally found in the interiors of continents and are characteristically composed of ancient crystalline basement crust of lightweight felsic igneous rock such as granite. They have a thick crust and deep roots that extend into the mantle beneath to depths of 200 km.

What are the 4 eras?

The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras The Geologic Time Scale is the history of the Earth broken down into four spans of time marked by various events, such as the emergence of certain species, their evolution, and their extinction, that help distinguish one era from another.

How are eons determined?

Classifying time. To make geologic time easier to comprehend, geologists divided the 4.6 billion years of Earth’s history into units of time called eons. … These units are called geochronologic units, (geo = geology + chronologic = arranged in order from the earliest to the most recent).

What is the next era called?

The next-larger division of geologic time is the eon.

How old is the earth?

4.543 billion yearsEarth/Age