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EASC 101 (3)
Lecture 6

Lecture 6.odt

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Simon Fraser University
Earth Sciences
EASC 101
Glyn Williams- Jones

Ch.8: Sedimentary Rock Record Sedimentary environments -Marine -Transitional -Continental Sedimentary Facies -Different sediments often accumulate adjacent to one another at the same time -Each unit or facies has distinctive characteristics -The conditions of the particular environment -Gradual transition Deciphering Paleo Environment- Lithology Lithology= rock type Example: limestone Limestone is mainly formed in marine settings that are relatively low energy (away from shore). Example: sandstone Sandstone is formed in higher energy settings, including marine settings (close to shore), transitional settings (at the shore), and continental settings such as river beds. Grain Size Grain size - the grain size of detrital rocks gives clues as to the energy of the medium that deposited the sediment Mud (silt and clay) = Quiet/low energy environments Sand= Higher energy environments Gravel= Very high energy environments Fossils Body fossils-the actual remains of organisms Biogenic structures (trace fossils)-the remains of an organism’s behaviour, such as footprints and burrows. E.g- Dinosaur trackways in Utah
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