From the Soil Micromorphology Slide Collection

Data for the horizon
Horizon sampled: C3
Depth sampled: 245-420 cm
Physical and chemical data available: Sand = 76.2%, silt = 18.3%, clay = 5.5%, bulk density =
1.30 Mg m·3, CBD Fe203 = 0.84%, pH = 5.63, base saturation = 10%
Macromorphological description of horizon: Variegated red (2.5 YR 5/8), reddish yellow (5 YR 6/6), yellow (10 YR 7/6) fine sandy loam; massive, friable; moderately acid.
Micromorphological description of horizon: Rock controlled microstructure, peds are absent. Void space is made up of vughs (7.3% and 30-300 µml, and packing (6.7% and 30-300 µm) and complex voids (300-1300 µm).
Mineral components have a c/f chitonic-gefuric related distribution pattern (c/f limit at 20
µm). Birefringence fabric is absent, and 0.3% of the fine material occurs as oriented clay. Mineral grains consist of : quartz, which had less than 25% pellicular and less than 25% irregular linear alteration; mica (5-300 µml, which shows 25% to total parallel linear and less than 25% pellicular alteration; and feldspar (1.8 µm ), which shows less than 25% cross linear and less than 25% pellicular alteration. Mica-gneiss rock fragments are common.
Typic vughs and packing void textural coatings (12-50 µm) occur. These show parallel micro lamination and orange color under PPL. They are composed of limpid clay with a sharp orientation.
A few irregular and typic nodules occur. The irregular nodules range in size between 100- 300 µm, and are moderately impregnated, while the typic nodules are between 100-500 µm, and are strongly impregnated. Both types are rich in Fe.

Data for thin section
Preparation of sample: Air dry
Impregnating medium: Epoxy
Thickness of section: 30-35 µm
Orientation of section: Vertical

Soil Classification
U.S.: Typic Hapludult

Elevation: 300 m
Physiographic position: Upland
Topography and hill slope position: Summit
Parent material: Mica-gneiss
Vegetation: Oak woodlands
Drainage class: Well

Data for 35-mm slide
Frame length: 7.6 mm
Light mode: Cross-polarized

Source - Mark Stolt

Slide MS12. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.