Relative Age & Correlation

Which sequence of geologic events occurred after the formation of the Cambrian limestone and before the formation of the Silurian limestone?

Which rock layer is the youngest?

The photograph below shows an outcrop with two basaltic intrusions, labeled A and B, in a rock unit, labeled C. What is the relative age of these three rock units from oldest to youngest?

Letters W, X, Y, and Z represent fossils found in the rock layers. Which fossil could best be used as an index fossil?

Which principle states that these sedimentary rock layers were originally deposited as horizontal sediment layers?

Which principle states that the oldest sedimentary layers are deposited first, and should be found closest to the bottom?

When did faulting along line XY occur?

When did intrusion A occur?

If the granite intrusion occurred 56 million years ago, what are the most probable ages of the schist and shale, in millions of years?

The rock that formed in the contact metamorphic zone between rock unit E and rock unit F is