GLY-2250 Chapter 5: Chapter 5- Sedimentary Environments
Document Summary
We can learn a lot from ancient environments, including more about the organisms that once lived within it. Ca(cid:374) also tell (cid:455)ou (cid:449)here (cid:455)ou"ll fi(cid:374)d (cid:374)atural gas or petroleum. Coring: tube is driven into a sedimentary deposit and then withdrawn. Ancient soils can point to past climatic conditions. Topsoil: upper zone of many soils mostly sand and clay mixed with humus. Humus: organic matter that give topsoil dark color decayed plants by bacteria supplies nutrients for other plants in return. Freshwater lakes and glaciers leave clues to ancient climates. Freshwater lake environments: form basins that lie at lower elevations than most soils, thus helping lake deposits survive erosion. Unsorted heterogenous material is till lithified till is tillite: at furthest reach of glacier, till plows up in front and it left in standing ridges called moraines. Deserts and arid basins accumulate salt and sand. Desert: little organic matter little rain erodes and sends sediment to desert basins.
