What is fossil dating help christian daughter dating athiest

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When a scientist finds a section of rock that has lots of different strata, he assumes that the bottom-most layer is the oldest, and the top-most layer is the youngest.

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Index fossils help us to distinguish between rock strata from different time periods, so it's important that they don't cover too much historical ground.

We wouldn't want to use a horseshoe crab fossil, because horseshoe crabs have existed for over 400 million years and are still alive today!

Some of the scientists' favorite index fossils are trilobites, ammonites and scallop shells.

So, how exactly is an index fossil used for relative dating of rocks?

Free 5-day trial You may already know how to date a fossil with a rock.

But did you know that we can also date a rock with a fossil?Let's say in the first outcrop, he found an upper rock layer containing ammonite fossils and a lower layer containing scallops.In the second outcrop, miles and miles away, he also found two layers; but these layers were different.One outcrop shows layers from one geologic time period, while the other outcrop represents a different time. Can he put the pieces together to make the story more complete? Let's find out how scientists deal with this common problem by using the fossils inside the rocks.Back in 1793, there lived a land surveyor named William Smith.Stegosaurus and Triceratops were not part of the same assemblage because they lived at different times.

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