객관식
Which of the following is an example of a biomarker found in the fossil record?
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24. History of Life on Earth
The Fossil Record
객관식
What type of fossil dating technique would be most accurate for a trilobite from ~400 million years ago?
A
Carbon 14 dating of the fossils itself.
B
Carbon 14 dating of the surrounding volcanic ash.
C
Uranium 238 dating of the surrounding volcanic ash.
D
Uranium 238 dating of the fossils itself.
검증된 단계별 안내1
Understand the concept of radiometric dating: Radiometric dating is a method used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they formed.
Recognize the limitations of Carbon-14 dating: Carbon-14 dating is effective for dating materials that are up to about 50,000 years old. Since trilobites are from ~400 million years ago, Carbon-14 dating is not suitable.
Identify the appropriate isotopes for older fossils: For dating older fossils, isotopes with longer half-lives, such as Uranium-238, are more appropriate. Uranium-238 has a half-life of about 4.5 billion years, making it suitable for dating ancient geological materials.
Consider the context of the fossil: Fossils themselves are often not directly dated. Instead, the surrounding rock layers, such as volcanic ash, are dated to provide an age for the fossil. This is because the fossil may not contain the isotopes needed for radiometric dating.
Conclude with the most accurate method: Given the age of the trilobite (~400 million years) and the limitations of Carbon-14, Uranium-238 dating of the surrounding volcanic ash is the most accurate technique for determining the age of the fossil.
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