EVSC 2800 Lecture Notes - Lecture 6: Septic Tank, Losing Stream, Mudrock
18 Feb 2016
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Document Summary
The physiographic provinces of the appalachian mountains are underlain by distinct rock types. The valley and ridge province is underlain by folded sedimentary rocks, and limestone is commonly found there. Karst landscape characterized by caves, springs, sinking rivers, and sinkholes. In contrast, the attack of carbonic acid on feldspare yields a residual clay, a constituent of soil. The weathering of aluminosilicates left a solid residue (soil). The dissolution of limestone leaves an opening in the subsurface. Water has to come into contact with the limestone bedrock in order to dissolve it. Caves in limestone usually originate as solution-enlarged fractures, joints, and bedding planes. Underground conduits can carry large amounts of water. Water from the land surface can be redirected to the subsurface entirely, leaving karst terrains with few surface streams or with sinking streams. Later, when the water resurfaces, it forms a spring. Springs places where groundwater discharges through natural openings in the ground.
