Fossils that are the most useful for correlation tend to be found in various types of rocks, are widespread, and easy to recognize. One rock type where fossils are found is sedimentary rocks.
Carbon dating and radioactive dating are more effective, assuming those arn't the same thing. =]
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.
its radioactive dating and relative dating
Radiometric dating comes from the fossils themselves very rarely. Most of the time the dating method interprets the strata surrounding the fossil.
Carbon 14 is useful for dating organic remains less than 60-70,000 years old. It is not useful for fossils as the vast majority are much older than that.
The half life of C14 is about 5700 years, so items that are a few multiples of this time are suitable for carbon14 dating. Most archaeological items are suitable, and some young fossils.
Carbon14 dating (isotopic dating)
Radiocarbon dating cannot be used to determine the age of fossils or "of the earth" because these materials no longer have radiocarbon or have negligible amount of radiocarbon.
In what ways are fossils useful to geologist?
Yes, but the dating is only off a little (500 years or so).
The connection between fossils and half- life dating is that half-life dating is to determined how old the fossil is
Uranium dating is useful for long periods of time - e.g. 109 years. For fossils is recommended the method with 12C.
The main limitations of using Carbon14 dating to find the age of something that is carbon base are firstly the possibility that carbon may be absorbed by some things making it more difficult to get an absolutely accurate age and secondly, with Carbon14 only having a half life of 5,568 years the maximum theoretical limit for detection is 100,000 years.
they are useful for alot of things like petrol