What type of unconformity is under layer I in the diagram be…

What type of unconformity is under layer I in the diagram below? [BLANK-1]  What type of unconformity is under layer C? [BLANK-2] Which is younger, unit B or unit G?[BLANK-3] Which of these rock units could you use to determine an absolute age: F, B, D, or I? [BLANK-4]   cross-section_GW_22S.png