To which layer can geologists apply the principle of faunal succession to determine the age of the me now

ANSWER:

In Flat layers, sedimentary rock geologist applies the principle of faunal succession to determine the age of the layer.

EXPLANATION:

When the organism and plants die then their fossil is remained in the sedimentary rocks. The younger fossils remain in upper layer and the older fossil remains in the lower layer. Hence the layer may differ accordingly to apply the faunal succession in accordance to the fossil's age. The comparison with these fossils to the index fossil will give the exact age of the rock layer.