EESA06H3 Lecture Notes - Lecture 8: Absolute Dating, Unconformity, Radiometric Dating
Document Summary
We"(cid:448)e talked a lot a(cid:271)out ea(cid:396)th su(cid:396)fa(cid:272)e p(cid:396)o(cid:272)esses, plate te(cid:272)to(cid:374)i(cid:272)s. i thi(cid:374)k (cid:455)ou"(cid:448)e got the idea (cid:374)o(cid:449) that the(cid:396)e"s a lot of geologi(cid:272) ti(cid:373)e, (cid:449)hat (cid:449)e (cid:272)all deep time. 4. 5 billion years: so the question inevitably comes up, you know, you look at a rock. We (cid:272)a(cid:374) put (cid:396)o(cid:272)ks i(cid:374) a (cid:396)elati(cid:448)e age positio(cid:374), e(cid:448)e(cid:374) though (cid:449)e do(cid:374)"t k(cid:374)o(cid:449) the a(cid:271)solute age. So maybe two- thirds of the lecture is on relative age dating and then the last third will be on the techniques we use, chemical techniques to provide absolute age dates. Terms to remember: >>>strata >> layers of rock, o let"s use the (cid:449)ell-worn clich of the book. And a lot of geology is made up of book-like arrangements of rock layers. And if they contain fossils, we can put them in a relative age. And if we have absolute ages we can put actual page numbers on it: but the (cid:271)ook has a sto(cid:396)(cid:455).
