What is the uniformitarian explanation for why different fossils are found in different strata?

Uniformitarian explanation for why different fossils are found in different strata is that each strata represents a particular period in earth's history and the fossils in that strata represent the organisms that lived on earth during that period.

Explanation:

Each layer of rock represents a period in earth's history. Recent period is represented by the topper layers of rocks and soil. The uniformitarian explanation for different fossils being found in different layers is that different organisms lived on earth during different periods.

Some organisms have become extinct while some earlier organisms still thrive on earth. Each layer of rocks contains fossils of the organisms that lived on earth during hat particular period.