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2 Soil Formation 1
- 7. Igneous Rock Basalt Granite Black Canyon of the Gunnison http://enterprise.cc.uakron.edu/geology/natscigeo/Lectures/igneous/volcano2.htm#igrx
- 26. The Grand Valley was covered by this shallow sea that advanced and retreated many times leaving a 4000 foot thick salt laden clay soil.
- 35. It Is Not Uncommon to Clean Six Inches of Silt from Irrigation Ditches Each Year.
- 36. The River Loam is then Incorporated into the Mancos Shale thus Enriching the Soil.