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Argillic Horizons in Stratified Drift

Luverne End Moraine, Eastern North Dakota

Dep. of Soil Science, 106 Walster Hall, North Dakota State Univ., Fargo, ND 58105

View larger version (25K): [in a new window]   Fig. 1. Location of the Luverne end moraine in Barnes County, North Dakota. Valley City precision farming site is shown by circle.

View larger version (52K): [in a new window]   Fig. 2. Landscape and pedon description sites at the Valley City precision farming site: Barnes County, North Dakota. Soil profiles with laboratory or micromorphologic analyses are shown by filled diamonds (32, 36, and 40).

View larger version (15K): [in a new window]   Fig. 3. Ratio of fine clay to total clay in three pedons with genetic argillic horizons; lithologic discontinuities indicated by dashed line for each pedon (see Fig. 2 for location).

View larger version (14K): [in a new window]   Fig. 4. Well-drained settings typical of argillic horizons at the study site shown by relief on east–west transects near Pedons 36 and 40 (vertical exaggeration x6).

View larger version (129K): [in a new window]   Fig. 5. Fine and very fine sand from the 25- to 28-cm depth in the Bw horizon from Pedon 40 (scale bar = 200 µm).

View larger version (190K): [in a new window]   Fig. 6. Bleached sands on continuous clay fabric from the 40- to 43-cm depth in the 2Bt horizon from Pedon 40 (scale bar = 200 µm).

View larger version (170K): [in a new window]   Fig. 7. Continuous thick clay films from the 55- to 58-cm depth (2Bt horizon) in Pedon 40 (scale bar = 200 µm).

View larger version (140K): [in a new window]   Fig. 8. Fine sand grains enveloped in continuous thick clay films from the 65- to 69-cm depth (2Btk1 horizon) in Pedon 40 (scale bar = 200 µm).