The most widely scattered areas. These are called fossil Guide to Fossils Index fossils (guide or index fossil)
.• The absolute age (absolute age) refers to the age of rocks, fossils. Nature or geological events (often measured in years such as a thousand years, a million years) generally refers to the age determined from the isotopes of radioactive elements.life period)
Elements, such as c-14 has a half life of 5,730 years, is used with a rock or fossil, archaeological aged 50,.000 years of k-40 u-238 or use the stone age, which is how complex and costly mineral with a very small amount of radiation. This method is called Age of the detection of radioactive substances (radiometric age dating).Or fossil is the key principle is to compare the ratio of radioactive elements remaining (end product) occurring radioactive isotope of the precursor (parent.Or fossils, such as
How to uranium 238 - lead 206 to uranium 235 - lead 207
How to potassium 40 - argon 206 to rubidium 87 - strontium 87
to carbon 14 - nitrogen 14
dating using radioactive elements have two reasons.
1.Help in determining the exact age of the fossil and then stratigrapy
2. Helps tell the story of an era. Pre Kashubian
2.2 Cam Evidence and data lithosphere
.Of geological data in various fields. Evidence of changes in lithosphere. And the discovery of fossils of plants and animals of the same age and same species in different continents. The distances Convinced that the continentsSeparated students will study the concepts of geologists about the evidence. Such further
2.2.1 joints lithosphere plates considering today's world. 'll Find that each continent is shaped different continents. In the past, different continents These figures, however, the model year. Students will observe the shape of the continents. In the past, the following activities
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