Principle of Lateral Continuity: We've established that we can correlate layers across distances, but is it also possible to correlate rock units above and below a designated unit? Why, or Why not?
Correlation Using Nonconformity: Would you expect to find the Tapeats Sandstone on top of the Great Unconformity in all places in the Grand Canyon? Why, or why not?
Faulting and Relative Dating: Is the fault older or younger than the stream? Why?
Trace Fossils-Reptile Tracks: How can such trace fossils help a geologist reconstruct ancient environments?
Body Fossils-Brachiopods: If you were to reconstruct an ancient sedimentary environment, would you rather study one fossil type or several different ones? Why?