BIO211 - Chapter 5 - Paleogeography geography of the past...

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Paleogeography – geography of the past Why study it? - Learn about distribution of land and sea - Identify localized environmental features of the past - Framework to interpret life of the past (eg prove where species lived like dinosaurs) - Use to identify locations of natural resources Soil: - loose sediments that contain organic matter and accumulate in contact with atmosphere - supplies nutrients and physical support for plants Topsoil: - upper most layer consisting of sand and clay mixed with humus Humus: - organic matter that gives topsoil it’s dark color. - Derived from decay of plant debris - Important for the ecosystem!!!! Different types of soil according to climates. Warm Climates - Caliche: evaporation of groundwater causes calcium carbonate to precipitate as nodular or massive deposits known as caliche Tropical Climates - Warm waters percolate and destroy humus by oxidizing compnents - Silicate materials break down to form laterites Soils can be found beneath unconformities but might be hard to identify because of chemical alterations. They are reflective of the climate they are formed under. Lake deposits are characterized by thin horizontal layers, few burrows and an absence of marine
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This note was uploaded on 12/05/2011 for the course BIO 211 taught by Professor Jessica during the Spring '11 term at University of Toronto- Toronto.

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BIO211 - Chapter 5 - Paleogeography geography of the past...

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