151 years 2.
In the picture below the igneous intrusion (V) was examined and scientists found that this rock had about 25% of the overall
Uranium 23s left in the composition of the rock. This fact helps scientists determine how old the intrusion is and in turn will give
clues about the age of the rock layers around and beneath the intruzion. Using the amount of Uranium 235 left in the intrusion
how old is the intrusion? What are the relative ages of the rock layers and fossils around and beneath the intrusion?