When geologists find an index fossil what information do they known about the rock layer in which the fossil was found?

How old the rock layer is.

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What is Fossil Mold?  Kahulugan ng fossil?  Where can you find an real amonite fossil?  A fossil that only appears in one rock layer?  Which is not a characteristic of index fossil?  Is a fossil within a rock harder vthan the layer itself?  Is it true that the closer the fossil to the earth the newer the fossil?  A man found a fossil that may come from a dinosuars what kind of rock is it?  What must occur for a fossil to form the organism must fall into inneous rock?  Hoe do you get omanyte in the fossil if you have alredy chosen the other fossil?  A researcher could quickly date a new rock sample if it contained what kind of fossil?