Trilobite
This is called an index fossil.
A fossil used to date surrounding rock layers is called a index fossil. Index fossils are particularly useful for determining the relative ages of rock layers in different locations.
Abundant fossil evidence first appeared in the geologic record during the Cambrian Period, around 541 million years ago. This period marked the rapid diversification of multicellular organisms, leading to the Cambrian Explosion, which left behind a rich fossil record of early marine life.
The abundant fossil evidence appeared in the geologic record around 541 million years ago during the Cambrian period when complex organisms started to evolve. This sudden appearance of diverse life forms is known as the Cambrian explosion.
An organism used to identify a specific geologic time period is called an index fossil. Index fossils are used by geologists to narrow down the age of rocks and sediment layers based on the known age range of the fossil species.
A fossil invertebrate from the Lower Cambrian period.
This is called an index fossil.
The sudden increase in invertebrate fossil diversity
They are called index fossils.
The absolute age of the index fossil was determine by radioactive dating or another absolute method
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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)
The relative age of a fossil that can be determined by comparing it to an index fossil is called biostratigraphic dating. This method relies on the known age range of the index fossil to estimate the relative age of the fossil being studied.
Index Fossil
Trilobites were associated with the Paleozoic era, from the Cambrian to the Permian.
To be useful as an index fossil fuel, spices must have existed for about 1000 years.
A fossil used to date surrounding rock layers is called a index fossil. Index fossils are particularly useful for determining the relative ages of rock layers in different locations.