EARTH121 Lecture Notes - Lecture 11: Proterozoic, Cenozoic, Oldest Dated Rocks

• School: University of Waterloo
• Department: Earth Sciences
• Course: EARTH121
• Professor: John Johnston

Document Summary

Bedro(cid:272)k is (cid:272)o(cid:448)ered (cid:271)y sedi(cid:373)e(cid:374)t (cid:449)hi(cid:272)h is (cid:449)hy (cid:449)e (cid:272)a(cid:374)(cid:859)t see it. The younger rock is towards the west. Quater(cid:374)ary to paleozoi(cid:272): there(cid:859)s a huge gap i(cid:374) history; erosio(cid:374) Relative: using other objects to compare and figure out which is older and younger. Geologic time: age for earth using many theories. Time: rocks, fossils, geologic structures, landscapes, tectonic events. Buoyant material, crust of a continent tells us the history of earth and the continent. Canadian shield is exposed: we can reach down and touch it. Archean core areas: oldest rock: up at great slave lake. Australia and canada have the oldest rocks which are exposed. The grand canyon: thick layers of strata: numerous gaps, a partial record of geological history. Types of unconformities (blanks: angular unconformity: the layers below the unconformity are angled, disconformity: unconformity between parallel layers of sedimentary rock, non-conformity: sedimentary rock lie above eroded metamorphic and igneous rock. Geologic column: describes deep time which is subdivided (blanks)