What is an index fossil?
Geologic Time Scale Part 1

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Science
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8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
An index fossil is a fossil that is used to define and identify a particular time period in the geologic time scale. It is typically widespread, abundant, and existed for a relatively short duration.
2.
FLASHCARD QUESTION
Front
Which fossil is considered the best index fossil?
Back
Fossil 2 is considered the best index fossil as it meets the criteria of being widespread and having a short geological time range.
3.
FLASHCARD QUESTION
Front
How do rock layers typically form?
Back
Rock layers form horizontally due to the force of gravity.
4.
FLASHCARD QUESTION
Front
What is the oldest known organism on the geologic time scale?
Back
The oldest known organism on the geologic time scale is the trilobite.
5.
FLASHCARD QUESTION
Front
What is the most recent era of the geologic time scale?
Back
The most recent era is the Cenozoic era.
6.
FLASHCARD QUESTION
Front
What does radiometric dating allow scientists to determine?
Back
Radiometric dating allows scientists to determine the exact or absolute age of rock layers and the fossils within them.
7.
FLASHCARD QUESTION
Front
What is the difference between relative age and absolute age?
Back
Relative age is the age of an object in relation to other objects, while absolute age is the actual age of an object, often determined through radiometric dating.
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