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Geological Time

Josh Jag. Ashley W. Alan E. Hannah U.
by

Scott Severino

on 14 January 2013

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Transcript of Geological Time

What is Geological Time? Geological Time Geological time scale to show Earth's history Time scale is a record of life forms and geological events in history. Earths history is like a day in 24 hours
- 12:01 am Earths forms
- 7:00 am organisms appear
- 7:00 am - 9:00 pm simple organisms develop
- 9:00 pm complex organisms develop
- Humans appear before midnight Eras- Precambrian 544 m.y.a Ancient Life: Paleozoic- 544- 245 m.y.a
245-208 208- 144 144- 66.4 m.y.a Middle Life- Mesozoic- Triassic; Jurassic; Cretaceous Recent Life- Cenozoic- Tertiary- 65 m.y.a The first geological time scale was soon after the discovery of radioactivity, and using it Homles estimated that the Earth was about 4 billion years old this was much greater than previously briefed. The time of the physical formation and development of the earth.

(earth was created about 4.5 to 4.6 billion years age)

earth was today
created



Geolgical time

Examples: Jurassic Trassic period. GEOLOGICAL TIME SCALE FOSSIL RECORD Absolute dating is the process of determining an approximate age for an archaeological or palaeontological site or artifacts. Eon- The longest period of geological time, All existing eons are at least half a billion years in duration, but an eon is not a specific, defined length of time.

Era-A period of time marked by distinctive character, events, etc.

period-A unit of geological time during which a system of rocks formed.

Epoch-A period marked by distinctive character or reckoned from a fixed point or event. ABSOLUTE DATING It is a way of finding out how old something is, based on the chemistry of its molecules. used for things thousands or hundreds of thousands of years old. Relative dating is the science determining the relative order of past events, without necessarily determining their absolute age. RELATIVE DATING RAIOCARBON DATING MORE VOCAB K-T BOUNDARY it is a way of finding out how old something is, based on the chemistry of its molecules. used for things thousands or hundreds of thousands of years old. GEOLOGICAL DATING INDEX FOSSIL FOSSILS A fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found. MASS EXTINCTION When an entire class of animals die. INTERESTING NOTES!! The layer of clay dating to approximately 65 million years ago; it coincides to an asteroid impact in the Yucatan, in Mexico, that most likely caused and/or contributed to the extinction of more than half of all species living on Earth at that time. LAW OF SUPERPOSITION States that in any given collection of sediment or rock left undisturbed, the youngest layer is the top layer and the oldest is the bottom. For example, if a layer of mudstone is directly atop a layer of basalt, the basalt is the older of the two layers. GEOLOGICAL COLUMN QUESTIONS!! 1. Which of these are the longest period of time? 2. The first geological time scale was propsed in 1913 by the British geologist Arthur Holmes(1965-1990.) By: Hannah Uranga
Ashley Wells
Alan Epperson
Josh Jag. The theoretical classification system for the layers of rocks and fossils that make up the Earth's crust. A. Epochs B. Eras C. Eons D. Periods Whats the diffrence between organisms that appear at noon then the ones that appear at 9:00? Bibliography
By: Charles J. Caes The Age Of The Earth Earth Changing Surface 1) C. Eon 2) Noon-simple organisms develop
9:00-more complex organisms develop DEMONSTRATION!! (geological clock) ANSWERS!! Earths history is like a day in 24 hours
- 12:01 am Earths forms
- 7:00 am organisms appear
- 7:00 am - 9:00 pm simple organisms develop
- 9:00 pm complex organisms develop
- Humans appear before midnight Dictionary.com
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