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Pit 8

501A Finchford Loamy Sand

Ap horizon - 0 to 16 cm; very dark brown (10YR 2/2) sandy loam; medium sand, 0.5 to 0.7 roundness, 0.9 sphericity, 20% quartz; weak, medium, subangular blocky structure; friable, non-sticky, non-plastic consistence; no acid reaction; few, 1 to 2 cm, rounded 1.5, subdiscoidal 4.5, no orientation, many lithologies clasts; few, fine, roots; abrupt, smooth boundary.

AB horizon - 16 to 21 cm; dark brown (10YR 3/3) sandy loam; medium sand, 0.5 to 0.7 roundness, 0.9 sphericity, 20% quartz; weak, medium, subangular blocky structure; friable, non-sticky, non-plastic consistence; no acid reaction; few, 1 to 2 cm, rounded 1.5, subdiscoidal 4.5, no orientation, many lithologies clasts; abrupt, smooth boundary.

B horizon - 21 to 44 cm; dark yellowish brown (10YR 4/4); medium sand, 0.5 to 0.7 roundness, 0.9 sphericity, 20% quartz structure; no acid reaction; few, 1 to 2 cm, rounded 1.5, subdiscoidal 4.5, no orientation, many lithologies clasts; abrupt, smooth boundary.

C1 horizon - 44 to 62 cm; dark yellowish brown (10YR 4/6); medium sand, 0.5 to 0.7 roundness, 0.9 sphericity, 20% quartz structure; no acid reaction; many, 1 to 3 cm, subrounded 3.5, subdiscoidal/subrismidal 1.5, no orientation, many lithologies clasts; abrupt, smooth boundary.

C2 horizon - 62 to 80 cm; brownish yellow (10YR 6/8); medium/coarse sand, 0.5 to 0.7 roundness, 0.9 sphericity, 30% quartz structure; no acid reaction; abrupt, smooth boundary.

C3 horizon - 80+ cm; strong brown (7.5YR 4/6); coarse sand, 0.5 to 0.7 roundness, 0.9 sphericity, 20% quartz structure; no acid reaction; many, 1 to 3 cm, subrounded 3.5, subdiscoidal/subprismidal 1.5, no orientation, many lithologies clasts.

 

Pit 8 Soil Profile

View of Pit 8 Soil Profile

 

Summary

Pit 8 is located mid slope in an abandoned corn field used for cultivation as recently as the previous growing season. Soils in this location are mapped as the Hubbard Series in the Pepin County Soil Survey, Wisconsin 1964, and as the Finchford loamy sand in the Pepin County Soil Survey, Wisconsin 1999. Our observations are generally consistent with the Hubbard Soil Series which is now mapped as 501A Finchford Loamy Sand 0 to 3 percent slopes, with a few slight discrepancies. We found the Ap layer to be thinner in our soil pit than is described in the Finchford series. We also found this Ap layer to be a combination of an Ap and an AB layer. What the Finchford series describes as an AB layer, we found to be a B. Finally, the Bw layer described in the Finchford series was found to be a C1 layer in our soil pit. These minor differences lead us to conclude that the soil series observed in pit 8 is most consistent with the Finchford loamy sand 0 to 3 percent slopes as described in the Soil Survey of Pepin County, Wisconsin 1999. Similarities observed between the Finchford series and the soil profile of pit 8 include: presence of an Ap, C1, and C2 layer, structure (medium, subangular blocky), and parent material (sandy/gravelly outwash).

Contributed by Group 8: Isaac Grace, Mike Selb, and Sandy Yassin

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