Contest materials and resources

Current Materials:

• Guidebook Version 3.0 2025-Final

  • Constructed removed from Landform options

  • Low Hydraulic Conductivity class definition updated to clarify moderate organic matter is greater than or equal to 2%

  • Argillic diagnostic ​criteria corrected

  • Wetness Features added as diagnostic subsurface horizon option, which should be marked when depletions or a reduced matrix are present. Aquic removed to avoid confusion with Aqu taxonomic classes. Note that it is possible to have Wetness Features that do not influence Wetness Class or Site Interpretations if there is no evidence of a high water table or ponding. 

  • Contrasting particle size family class updated to include relevant examples for the area​

• Scorecard Version 3.0 2025-Final

  • "Constructed" removed from Landform options​

  • "Wetness Features" added to Diagnostic Subsurface Horizons, "Aquic" removed

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Geology Materials

• Omaha Geology Background text

• Omaha Geology Talk

• Quaternary Geology of Nebraska - slides

• Muhs 2007 Loess Origins

• Muhs et al 2008 Loess

• Korus et al 2021 Pre-Illinoian ice margins

• Mason and Joeckel Surficial Geology Platte River Valley

• Links for more info

• Nebraskaland Magazine Article: When Rain Followed the Plow

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Previous Versions

• Guidebook Version 2025-8-29v2

• Scorecard Version 2025-8-29

• Guidebook Version 2025-8-29

  • Edits: Separated Alluvium/Old Alluvium parent material, Terrace/Paleoterrace Landform; added z, y subordinate horizons​

• Scorecard Version 2025-8-29

  • Edits: Separated Alluvium/Old Alluvium parent material, Terrace/Paleoterrace Landform

• Guidebook Version 2025-8-18

• Scorecard Version 2025-8-18

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