From the Soil Micromorphology Slide Collection

Micromorphological description of slide: llluvial clay coatings line channels, suggesting that they are stable and continuous conduits for water and suspended clay

Data for the horizon Horizon sampled: Btg1 Depth sampled: 60-75 cm
Physical and chemical data available: Sand = 6%, silt = 67%, clay = 26%; pH = 5.8; OC = 4.8
g kg-1; dithionite Fe = 3647 mg kg-1
Macromorphological description of horizon: 1OYR 4/2; heavy silt loam; weak fine and medium subangular blocky parting to weak very fine platy structure; many thick continuous 1OYR 8/1 silt coatings on horizontal ped faces and lining root channels; common continuous 7.5YR 4/2 and 5YR 2.5/2 clay coatings on horizontal ped faces.
Micromorphological description of horizon: Single-and double-spaced porphyric related distribution pattern; stipple-speckled birefringence fabric.

Data for thin section
Preparation of sample: Air dry
Impregnating medium: Polyester
Thickness of section: 30 µm
Orientation of section: Vertical

Soil Classification
U.S.: Fine-silty, mixed, mesic Argiaquic Argialboll (Vesser series)

Environment
Physiographic position: Footslope above floodplain of perennial stream Topography and hill slope position: 4% slope; colluvial footslope Parent material: Collurium derived from loess
Climatic data: MAP = 864 mm; humid continental
Drainage class: Poor
Vegetation: Pasture grasses

Data for 35-mm slide
Frame length: 7 mm
Light mode: Circularly polarized

Thompson, M. L. 1987. Micromorphology of four Argialbolls in Iowa. p. 271-277. In N. Fedoroff et al. (ed.) Micromorphologie des sols. Proc. 8th Working Mtg. on soil micromorphology, Paris, 1985. AFES, Plaisir.
Source - M. L. Thompson

Slide MS11. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.