Era Period Epoch Printable

Era Period Epoch Printable Figure PageIndex 4 The periods middle row and epochs bottom row of the Cenozoic era 8 01 The Geological Time Scale fig8 1 4 Most of the boundaries between the periods and epochs of the geological time scale have been fixed on the basis of significant changes in the fossil record

Age of Invertibrates Precambrian comprises about 88 of geologic time 4500 Adapted from Lutgens and Tarbuck They cite the Geological Society of America as the source of the data There is another kind of time division used the eon The entire interval of the existence of visible life is called the Phanerozoic eon Figure 8 1 4 image description The periods and epochs that make up the Cenozoic era Period Epoch Time span Paleogene Paleocene 65 5 to 55 8 Ma Paleogene Eocene 55 8 to 33 9 Ma Paleogene Oligocene 33 9 to 23 0 Ma Neogene Miocene 23 0 to 5 3 Ma Neogene Pliocene 5 3 to 2 6 Ma Quaternary Pleistocene 2 6 Ma to 11 700 years

Explain the difference between relative and absolute age dating techniques Summarize the history of the geological time scale and the relationships between eons eras periods and epochs Understand the importance and significance of unconformities Estimate the age of a rock based on the fossils that it contains

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Era Period Epoch Printable

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Geological Timechart British Geological Survey

https://www.bgs.ac.uk/discovering-geology/fossils-and-geological-time/
The principal chart shows the Phanerozoic Cambrian to Quaternary timescale The names of the individual periods are links each one leads to a more detailed chart showing the epochs and ages for that period The charts for the individual periods are all

Geologic Time Scale A List Of Eons Eras And Periods ThoughtCo

https://www.thoughtco.com/geologic-time-scale-eons-eras-periods-1440796
Era Period Dates Ma Phanerozoic Cenozoic Quaternary 2 58 0 Neogene 23 03 2 58 Paleogene 66 23 03 Mesozoic Cretaceous 145 66 Jurassic 201 145 Triassic 252 201 Paleozoic Permian 299 252 Carboniferous 359 299 Devonian 419 359 Silurian 444 419 Ordovician 485 444 Cambrian 541 485 Proterozoic

Geologic Time Periods Time Scale amp Facts Britannica

https://www.britannica.com/science/geologic-time
The geologic time scale is the calendar for events in Earth history It subdivides all time into named units of abstract time called in descending order of duration eons eras periods epochs and ages

GEOLOGIC TIME SCALE V 6 Geological Society Of America

https://www.geosociety.org/documents/gsa/timescale/timescl.pdf
The numbered epochs and ages of the Cambrian are provisional A before a numerical age estimate EON ERA BDY AGES Ma 1000 1200 1800 2050 2300 1400 1600 2500 2800 3200 EPOCH AGE PICKS MAGNETIC PERIOD HIST CHRO N POLARITY QUATER NARY PLEISTOCENE HOLOCENE CALABRIAN GELASIAN C1 C2 C2A C3

Epoch Eras Periods amp Ages Britannica

https://www.britannica.com/science/epoch-geologic-time
Epoch unit of geological time during which a rock series is deposited It is a subdivision of a geological period and the word is capitalized when employed in a formal sense e g Pleistocene Epoch Additional distinctions can be made by appending relative time terms such as early middle and

There are four eons recognized on the geologic timescale the Hadean Eon which is the oldest Archean Eon Proterozoic Eon and the Phanerozoic which is most recent Each of these eons had a significant difference in climate the composition of the earth and the life forms that lived then Epochs and Ages Periods of geological time are subdivided into epochs In turn epochs are divided into even narrower units of time called ages For the sake of simplicity only the epochs of the Paleogene Neogene and Quaternary periods are shown on the time scale at the top of this page

Students in Earth Sceince 385 are required to commit the geologic time scale below to memory Please note that each of these terms are proper nouns capitalized Each of the lecture examinations will include this as one of the questions asked Students may respond with EITHER Mississippian Pennsylvanian used in North America