What are the two major assumptions that uniformitarian geologists use in constructing the geological column?

1. Principle of Superposition

2. the index fossil found in a layer of rock

Explanation:

As the law of the uniformitarian in the geology states that the geologic process that has acted in the past operates in the present also but not with the same intensity as they used to operate. The geological column of the rocks depends on the process of the superimposition are found in the layers of the rocks.