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any fossil of wide geographical distribution and a short range in time
Minerva Orn
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What fossil used to compare the relative ages of fossils?
An index fossil. An index fossil's age is known, allowing scientists to know the relative age of other fossils based on their position relative to the index fossil. (Ex. If a fossil is deeper in the earth, it is older than the index fossil)
What is fossils organisms that lived a short period of time called?
They are called index fossils.
What must be true for a fossil organism to be useful as a index fossil?
The absolute age of the index fossil was determine by radioactive dating or another absolute method
What two things make a fossil an index fossil?
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What 3 requirements do index fossils have?
To be an index fossil, it must be widespread, commonly found (sometimes in groups) and have a short life span for which it lived. If a fossil meets all three of these requirements, it is considered an index fossil.
What is the index fossil of the Cambrian?
Trilobite
Fossil used to compare the relative ages of fossils?
index fossils
Which New York State index fossil may have been present in a rock layer that is missing due to the unconformity?
The trilobite is the index fossil
A fossil that is used to date surrounding rock layers is?
This is called an index fossil.
What is the fossil called that geologists use to determine rock ages?
Index Fossil
To be useful as an index fossil fuel spices must have existed for how long?
To be useful as an index fossil fuel, spices must have existed for about 1000 years.
What characteristics must a fossil have to be useful as an index fossil?
An index fossil must be of a rapidly evolving organism that only existed for a specific period of time, is easily recognizable, is abundantly preserved, and was widespread geographically. Most index fossils are therefore of marine organisms.
