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Geology Of Iowa Fens, C. A. Thompson, E. A. Bettis Iii, R. G. Baker
Geology Of Iowa Fens, C. A. Thompson, E. A. Bettis Iii, R. G. Baker
Journal of the Iowa Academy of Science: JIAS
Fens are peatlands which are dependent on groundwater discharge to provide nutrient enrichment. Fens are found in a variety of landscape positions and in most Iowa landform regions. This paper presents a classification system for Iowa fens based on landscape position, stratigraphy, and hydrologic factors. Iowa fens can be separated into six categories: 1) fens along valley wall slopes; the groundwater source for these fens is sand and gravel buried between glacial tills (inter-till); 2) fens in hummocky topography on the northwestern margin of the Des Moines Lobe landform region; the water source is sand and gravel buried within glacial …