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Trilobites: The Index Fossil There are many thousands of known species of trilobite fossils found worldwide. Trilobites are considered to be good index fossils because they evolved so rapidly, and this allows geologists the ability to date the rocks in which the trilobites are found. The discovery of trilobites is second only to the discovery of dinosaurs, and new species of trilobites are still being discovered today.
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∙ 8y ago
Wiki User
∙ 9y agoBrachiopods are good index fossils because these are abundant, easy to recognize, and are wide spread. Other good index fossils are corals and echinoids.
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∙ 9y agoTrilobites are creatures that lived hundreds of millions of years ago in the Earth's seas. That have become important cultural icons.
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∙ 13y agoTrilobites are classified as index fossils because they existed on Earth for a relatively short period of time.
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∙ 11y agothey can only be used as index fossils if they are widely spread out over a geological area
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What are index fossils and how are they used to determine the absolute age of sedimentary rocks?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
Fossil used to compare the relative ages of fossils?
index fossils
What is a perfect example of an index fossil?
Short spans of geologic time
What happened to the species that are now used as index fossils?
they are used
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)
Are trilobites used as index fossils?
because they changed slowly through time(:
Why did scientists use trilobites as index fossils?
Trilobites were rapidly evolving and widespread organisms, making them ideal index fossils.
Fossils such as trilobites that can be used to estabish the age of rocks are called?
I think they are called Index Fossils...
What are index fossils and how are they used to determine the absolute age of sedimentary rock?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What are index fossils and how are they used to determine the absolute age of sedimentary rocks?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What are index fossil and how are they used to determined the absolute age of sedimentary rock?
Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.
What are some examples for index fossils that begin with the letter T?
trilobites
Trilobites are index fossils because they?
because they change slowly through time
How paleontologists use trilobites fossils as index fossils for various geologic time periods?
Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
Fossil used to compare the relative ages of fossils?
index fossils
What are types of fossils?
Trilobites, Ammonites
How do paleontologist use trilobites as index fossils for various geological time periods?
Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
