Lecture 7, Soil Development GES175, Science of Soils.

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Presentation transcript:

Lecture 7, Soil Development GES175, Science of Soils

Parent Material  Soil primary secondary primary secondary minerals minerals

Transported Agent Deposit gravity Colluvial water Alluvial Marine Marine Lacustrine Lacustrine ice Glacial (till, moraine) wind Eolian Wide diversity within groups 3 Wide diversity within groups

Silver Creek Alluvial deposits

Flood Plain (First Terrace) Boise Valley Alluvial deposits

Boise Valley First Terrace looking north from second terrace

Pleistocene Ice Age 1. Major influence on soil materials 2. Glacial till and moraines (a) highly variable and heterogeneous (a) highly variable and heterogeneous (b) properties reflect source (b) properties reflect source 3. Glacial outwash and lacustrine deposits (a) streams from glacial melt = alluvium (a) streams from glacial melt = alluvium (b) lakes formed, when dried = lacustrine (b) lakes formed, when dried = lacustrine

Volcanic ash over alluvium Bonner Series