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0 B N{ 5GUC .l 62% = Paleozoic Spring 2022 GEL 109 There are two unconformities in the sequence of rocks shown by the darker wiggly lines. Relative Time Sequence of Events Place a number between 1 and 13 beside the geologic events, where the number corresponds to the correct relative timing of events with the oldest being event #1 and the youngest being event #13. Start be filling in the age information provided on the previous page on each of the features of the diagram, using the geological time scale as a reference, and then use the principles of relative dating and what you know about whether the rocks are sedimentary, igneous or metamorphic to draw further conclusions. It may be easiest to start with what you can determine as the oldest layer on the diagram and work forward in time. Table 3 | Geologic Event Number Formation of angular unconformity (wiggly line below Ssa) Formation of nonconformity (wiggly line below Cg) Intrusion of Granite (Gr) Intrusion of Diorite (Di) Formation of Andesite unit (V) Formation of Cg Formation of Ssc Formation of St Formation of Shb Formation of Lmb Formation of Ssb Formation of units Ssa, Lma and Sha Formation of schist (M) -~ ot = Pwo.oms\h.r. ol O Questions 1. How could you date the Ssb unit? Give the oldest possible age and the youngest possible age. Name the principle from page 1 you used to determine each and explain. Oldest age and principle, with explanation: S5 - 299 Ma using Yhe Erinciple of S0 POLI 0N S AaS the oldest Sediments are ot Fie B 3 e ) \u(}- YO Youngest age and principle, with explanation: 20 Ma Tx 15 aF¥ Yhe Xo0 2. Why is the unconformity under Ssa called an angular unconformity, while the unconformity under Cg is called a nonconformity? - anaolar uncon <‘-m\&\( - SQedment '8 |a jnq over vwed rockS L - (OCKS (v \\u‘(\ on 74|