GEO 1111 Lecture 8:

• School: University of Ottawa
• Department: Geology
• Course: GEO 1111
• Professor: David Schneider

Document Summary

Lecture 8: sedimentary rocks: sedimentary rocks form layers like the pages of a book. The layers record a history of ancient events and ancient environments on the ever-changing face of planet earth. Like a book, this history can be read by geologists: sedimentary rocks are a thin cover. 5% (by volume) of earth"s outer 15 km & 75% of exposed rocks contain evidence of past environments: tectonics, climate & life (fossils: rock types are based on the source of the material. Detrital/clastic rocks: transported sediment as solid particles chemical rocks: sediment that precipitates from solution or extracted from water by organisms (converted to shells/skeletons) Sedimentary process: physical features in rock tell how sediments were deposited and environmental conditions of deposition, 1. Physical & chemical changes (weakening & break down) that occur in rocks when they are exposed to the atmosphere & biosphere. 1. parent rock (e. g. granite vs salt) 2. climate (temperature and rain; e. g. desert vs rainforest)