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A Lithologic Discontinuity in Brant County Soils August 22, 2014

A Lithologic Discontinuity in Brant County Soils August 22, 2014. Outline. Introduction Study location and sites Observations Where is the lithologic discontinuity? How did it form here?. Introduction. To determine differences in soil development between cultivated and forested sites.

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A Lithologic Discontinuity in Brant County Soils August 22, 2014

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  1. A Lithologic Discontinuity in Brant County SoilsAugust 22, 2014

  2. Outline • Introduction • Study location and sites • Observations • Where is the lithologic discontinuity? • How did it form here?

  3. Introduction To determine differences in soil development between cultivated and forested sites

  4. Location of Study

  5. Location of Study • Lot 7&8, Concession 14 in Burford Township, Brant County.

  6. Site Description - Cultivated Site • Pit located in a corn field • Conventional till (tillage is being practiced)

  7. Site Description - Forested Site • Pit located in adjacent forested area. • Deciduous trees, shrubs, abundant leaf litter

  8. Observations Soil Profiles Lithologic Discontinuity Change in Mode of Deposition

  9. 0-30 cm 30-38 cm 38-46 cm 46-52 cm Soil Profile - Cultivated Site Ap Bm Aeg Btg Gleyed Brunisolic Gray Brown Luvisol Ckg 52+ cm

  10. LFH 0-5 cm 5-40 cm 40-83 cm 83-97 cm 97-112 cm 112+ cm Soil Profile - Forested Site Ah Aeg IIBtg IIIBg IIICk Humic Luvic Gleysol

  11. LFH 0-5 cm 5-40 cm 40-83 cm 83-97 cm 97-112 cm 112+ cm Lithologic Discontinuity • Silty clay band on top of a sandy loam deposit. Ah Aeg IIBtg IIIBg IIICkg

  12. How does this happen? Change in mode of deposition Geological processes Pedogenic processes

  13. Change in Mode of Deposition • Forested site - glacio-lacustrine deposition • Cultivated site - glacio-fluvial deposition

  14. 7400 yrs. BP Another deposition from glacial streams 8000 yrs. BP Glacial streams deposit materials 7600 yrs. BP Glacial lake is formed depositing silts and clays Ck IICkg Ckg Ckg IICkg IIICkg Geological Processes Development of Soil ProfileGeological Processes

  15. 6000 yrs. BP Development of Ah within Ck. Present More weathering, translocation, etc. develops IIIBg 3000 yrs. BP Eluviation, Illuviation creates Ae, IIBtg Ah Ah Ah Ah Ck Ae Ae IICkg IICkg IIBtg IIBtg IIIBg IIICkg IIICkg IIICkg IIICkg Pedogenic Processes Development of Soil ProfilePedogenic Processes

  16. Thank-You

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