Index fossils provide a reference of time throughout rock layers. In order to be a good index fossil, the life form must have lived for a short and specific amount of time and must have existed over a large area. Index fossils serve as a reference to geologists in correlating rock layers. They can match up (or correlate) the index fossils which helps them match up (or correlate) the rock layers.
In what ways are fossils useful to geologist?
to date a rock layer and other fossils within that layer
It is because the index fossils has better minds than the paleontologist.
Those types of fossils are called index fossils.
Index fossils
Because organisms that became index fossils lived only during specific intervals of geologic time, geologists can estimate the ages of rock layers based on the particular index fossils they contain.
im trying to figure that out myself
index fossils are useful for figuring out the age of a set of disturbed rock layers by index fossils are used to determine when rock layers were formed so if they were used to figure out the age of a set of disturbed rock layers than they can also figure out when they were formed .
The Eurypterids in these cross sections not useful as index fossil because they are only found in certain areas are a long lived organism
Index fossils are very important to geologists because they identify geological time periods. Index fossils are found within a specific layer of rock- So when one finds the age of the rock layer, that is also the age of the index fossil.
No because they have been alive for a very long time
index fossils