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Geologic Time Scale Project
Transcript of Geologic Time Scale Project
Scale Created by:
(Period 5) Our Comparison We are going to compare the time periods of the geologic time scale to the yards of a football field. Such as in what yards the Mesozoic Era began and ended.
We are also going compare the significant events that occurred in real life to the yards of a football. The Formula Involved In Calculating This Scale There are many different formulas you can use for the scale comparison. But there is a certain one we are going to use, which is the formula listed below.
1.) Draw an imaginary football field on your paper. The length of a football field from one goal line to the other is 100 yards. Turn the paper horizontally and draw two goal lines at opposite ends of the paper. Now make equal spaces in between the goal lines so you have lines indicating 10, 20, 30, 40, 50, 60, 70, 80, and 90 yards. The first goal line is 0 and the last goal line represents 100 yards
2.) On the 0 yard line, write "today." On the opposite goal line, write "formation of earth."
3.) To position some of the important events in the history of the Earth on the football field, use the following formula and solve for X. In each calculation, X represents the location of the event on the football field.
Event in real time of age Event location on Football field (x)
--------------------------------------- = --------------------------------------------
4,600,000,000 years (Earth Age) 100 yard (length of field) Geologic Time Scale There are four time periods in the geologic time scale. The first time period that occurred is the Precambrian Time. It started 4.5 billion years ago and ended 544 million years ago.
The second time period to occur is the Paleozoic Era, which began 544 million years ago and ended 251 million years ago.
The third time period to occur is the Mesozoic Era, which began 251 million years ago and ended 66 million years ago. The fourth time period is the Cenozoic Era. It began 66 million years ago, but it did not end because we still live in this era. What is A Geologic Time Scale? The geologic time scale is a system
of measurement that relates to time, and is used by geologists and other earth scientists to describe the timing and relationships between events that have occurred throughout Earth's history. Football Field This is the football field comparing the yards to the time periods and significant events. How The Fossil Record and the Law of Superposition are used to create the Geologic Time Scale As geologists studied the fossil record, they found major changes in life forms at certain times. They used these changes to mark where one unit of geologic time ends and the next begins. Therefore the divisions of the geologic time scale depend on events in the history of life on Earth. Key:
1 Yard = 46,000,000 Years The law of superposition is used to determine the relative age of sedimentary rock layers. According to the law of superposition, going vertically downward means the rock layers are older and going upwards means the rock layers are younger. Thanks For Watching Our Prezi! How Did Each Era End? The Precambrian Era ended about 540 million years ago with a global ice age which marked the beginning of the Cambrian Era. The Paleozoic ended with an extinction event, the cause of which is still under investigation. The Mesozoic Era ended with a big meteor hitting Earth causing a mass extinction. The Cenozoic Era has not yet ended, and hopefully would not end with the Human Race.