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PIT#6

Group #6

  A1:  0-17 cm; very dark brown (10YR 2/2), moist; sandy loam; medium sub-rounded, 0.7 sphericity, poorly sorted, mostly quartz with feldspar and other crystalline lithologies; very friable; medium granular structure; slightly sticky; non-plastic; common medium roots; no HCl reaction; abrupt smooth boundary.

         

  A2:  17-32 cm; dark brown (10YR 3/3) moist; sandy loam; medium sub-rounded, 0.7 sphericity, poorly sorted, mostly quartz with feldspar and other crystalline lithologies; very friable; medium granular structure; slightly sticky; non-plastic; few medium roots; no HCl reaction; abrupt smooth boundary.

 

  Bw:  32-35 cm; brown (7.5 YR 4/4) moist; sandy loam; medium sub-angular to subrounded, 0.7 sphericity, poorly sorted, mostly quartz with feldspar and other crystalline lithologies; medium, sub-rounded sand; weak sub-angular blocky structure; non-sticky; non-plastic; no roots; no clasts; no HCl reaction; abrupt smooth boundary.

 

  C1:  35-51 cm; dark brown (7.5 YR 3/4) moist; sub-rounded sand, 0.9 sphericity, well sorted, mostly quartz with feldspar and other crystalline lithologies; clasts: 2-5mm, 15%, subangular to subrounded, 0.9/0.7 sphericity, no orientation, basalt, granite, metamorphic lithology; no HCl reaction; abrupt smooth boundary.

 

  C2:  51-85.5 cm; dark yellowish brown (10 YR 3/4) moist; medium sub-rounded sand, 0.7 sphericity, moderately to well sorted, mostly quartz with feldspar and other crystalline lithologies; clasts: 5-20mm diameter, 10%, 0.7/0.9 sphericity; no orientation, basalt, granite, metamorphic lithology; no HCl reaction; abrupt smooth boundary.

 

 
Pit Profile #6

C3:  85.5-91 cm; dark yellowish brown (10YR 4/4) moist; medium to coarse sub-rounded sand, 0.7 sphericity, poorly sorted, mostly quartz with feldspar and other crystalline lithologies; clasts: 20-40mm, 50%, 0.9/0.7 sphericity, horizontal orientation, basalt, granite, metamorphic lithology; no HCl reaction; abrupt smooth boundary.

 

  C4: 91-122 cm; brown (7.5YR 4/4) moist; medium, sub-rounded sand, 0.7 sphericity, very well sorted, mostly quartz with feldspar and other crystalline lithologies; clasts: 2-5mm, <1%, 0.7/0.9 sphericity, no orientation, basalt, granite, metamorphic lithology; no HCl reaction; abrupt smooth boundary.

  

 C5: 122-134 cm; brown (7.5 YR 4/3) moist; coarse, sub-rounded sand, 0.7 sphericity, very well sorted, mostly quartz with feldspar and other crystalline lithologies; clasts: 2-5mm, ≤1%, 0.7/0.7 sphericity, no orientation, basalt granite, metamorphic lithology; no HCl reaction; wavy, clear boundary.

 

 

Conclusion

Soil Pit #6 is located on the slope shoulder of the terrace located 8-10 meters from the Hartnett drive.  The pit is located 2 meters from a tree line composed of Aspen and Prickly Ash.  Vegetation surrounding pit 6 is comprised of mainly grassy forbs. Soils in this location are mapped as the Finchford Series in new soil map data (Meyer Personal Communication 2001), and as Hubbard Loamy Sand 6-12 percent slopes (HuC2), in the Dunn County Soil survey (ref).  Our soil description generally is consistent with The Finchford Series, but there are some discrepancies.  The Finchford Series has a plow zone within its first horizon ours did not.  Because of these discrepancies, we think the Soil Profile of Pit #6 is most consistent with the Hubbard Loamy Sand (HuC2) Series as described in the Dunn County Soil Survey (ref).  Similarities between soil characteristics we observed in the Pit #6 soil profile and the Hubbard Series description include:  both have lost original surface material due to erosion, surface area is very dark brown, large A horizons (roughly32 cm in depth), the C horizon is roughly the same depth, and both descriptions have the same parent material (outwash plains and stream terraces).