Question - What are the 12 geologic time periods?

Answered by: Charles Brown  |  Category: General  |  Last Updated: 18-06-2022  |  Views: 1049  |  Total Questions: 14

The names of the eras in the Phanerozoic eon (the eon of visible life) are the Cenozoic ("recent life"), Mesozoic ("middle life") and Paleozoic ("ancient life"). The further subdivision of the eras into 12 "periods" is based on identifiable but less profound changes in life-forms. Having five separate Epochs within it (Paleocene, Eocene, Oligocene, Miocene, and Pilocene), this massive swathe of mammalian evolution time can be cut down to one Period: The Tertiary. There are three Geologic Eras currently identified. The Paleozoic Era, the Mesozoic Era, and the Cenozoic Era. See illustration at right. Each of the names of the Eras reflects the relative stage in the development of life. The known geological history of Earth since the Precambrian Time is subdivided into three eras, each of which includes a number of periods. They, in turn, are subdivided into epochs and stage ages. Currently, we're in the Phanerozoic eon, Cenozoic era, Quaternary period, Holocene epoch and (as mentioned) the Meghalayan age.

Let's take an in-depth look at these six periods, which include: Period 1 - Technological and Environmental Transformations, from 8000 B. C. to 600 B. C. ; Period 2 - Organization and Reorganization of Human Societies, from 600 B. C. to 600 A. D. ; Period 3 - Regional and Transregional Interactions, from 600 to 1450; Period

1 Answer. We live in the Holocene Epoch, of the Quaternary Period, in the Cenozoic Era (of the Phanerozoic Eon).

Age (geology) Segments of rock (strata) in chronostratigraphy Time spans in geochronology Notes to geochronological units Erathem Era 10 defined, several hundred million years System Period 22 defined, tens to ~one hundred million years Series Epoch 34 defined, tens of millions of years Stage Age 99 defined, millions of years

Phanerozoic Eon This is because the fossils are similar to animals and plants that are common today. The oldest is the Paleozoic Era, which means “ancient life. ” Fossils from the Paleozoic Era include animals and plants that are entirely extinct (e. g., trilobites) or are rare (e. g., brachiopods) in the modern world.

Phanerozoic Eon The period of time, also known as an eon, between the end of the Precambrian and today, The Phanerozoic begins with the start of the Cambrian period, 544 million years ago. It encompasses the period of abundant, complex life on the Earth.

Eons > Eras > Periods > Epochs The Eons are the largest interval units into which Geologic Time is divided and represented on the chart. There are four Geologic Eons. The first three, the Hadean, Archean, and Proterozoic Eons are frequently lumped together and referred to as the Precambrian.

Because of the time span of Earth's past is so great, geologist use geologic time scale to show Earth's history. Scientists first developed the geologic time scale by studying rock layers and index fossils worldwide. With this information, scientists placed Earth's rocks in order by relative age.

In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age but shorter than a period. The current epoch is the Holocene Epoch of the Quaternary Period. Rock layers deposited during an epoch are called a series.

Generally, a period lasts between three to seven days. A menstrual period that lasts longer than seven days is considered a long period.

The Precambrian Era comprises all of geologic time prior to 600 million years ago. The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period.

As nouns the difference between era and age is that era is a time period of indeterminate length, generally more than one year while age is the whole duration of a being, whether animal, vegetable, or other kind; lifetime.

What came after the Dark Ages? Most historians list the Middle Ages as the next era in the history of Europe, followed by the Renissance, and the Early Modern period.

The Bronze Age follows on from the Neolithic period and is followed by the Iron Age.