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Q: If you find rock layers contacting fish fossils in a desert what can you offer about the history of the desert?
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What are the 2 characteristics of sedimentary rocks that reveal the past history of the earth?

Presence of fossils and stratification of the rocks structure into different layers.


How does the position of fossils in layers show evolutionary changes?

Assuming the layers aren't deformed, the lowest deposition layers are the earliest. Later deposition layers accumulate on top of the earlier layers. Thus, the lowest layers have the earliest fossils, and the highest layers have newer fossils. By comparing the features of early and late fossils of a species, you can determine some of its evolutionary changes. Of course, not all features survive in a fossil - soft tissues, for example.


How do scientists date fossils and artifacts?

Dating fossils and artifacts are easy. Scientist can look and tell how old the fossils by how many layers is under it.


Are older fossils found in higher layers of earth or lower layers?

lower0000


Fossils that appear all over the world in certain rock layers are what?

Index fossils :)


What are index fossils and how are they used to determine the absolute age of sedimentary rocks?

Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.


What are index fossils and how are they used to determine the absolute age of sedimentary rock?

Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.


Why are index fossils useful for figure out the age of a set of disturbed rock layers?

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 .


What type of rocks form in layers and have fossils in them?

sedimentary


Where can you find the oldest fossils in sedimentary rock layers?

It would be found in the lower layers, rather that younger fossils which are found in the upper layers. ♥


Where would the oldest fossils be found in the rock layers?

The furthest down of all top layers.


If the same types of fossils are found in two separate rock layer its likely that the two rock layers?

If the same types of fossils are found in two separate rock layers, it's likely that the two rock layers ____.