From the Soil Micromorphology Slide Collection

Data for 35-mm slide
Description of biological feature: Sparitic calcite fills root cells and micritic calcite is generally precipitated around root exteriors.

Data for the horizon
Horizon sampled: BCkt
Depth sampled: 94-1 10 cm
Physical and chemical data available: Sand = 22%, silt - 58%, clay 20%; pH = 8.2, cac03 200 g kg-I ; OC = 2 g kg -I .
Macromorphological description of horizon: 10 YR 5/6 silt loam; massive structure; 10 YR 4/4 clay coatings; common, fine, prominent 10 YR 8/2 secondary carbonates.
Micromorphological description of horizon: Single-spaced porphyric related distribution pattern. Crystallitic birefringence fabric. Channel microstructure.
Data for thin section
Preparation of sample: Air dry
Impregnating medium: Polyester resin
Thickness of section: 30 µm
Orientation of section: Vertical

Soil Classification
U.S.: Typic Hapludalf

Physiographic position: Upland
Topography and hill slope position: 0-2% summit
Parent material: Late Weichselian loess
Soil climatic data and/or soil water balance: Mean annual temperature 10.5 degrees C; mean annual precipitation 634 mm
Vegetation: Deciduous forest

Frame length: 3500 um
Light mode: Circularly polarized

Thompson M.L., N. Fedoroff and B. Fournier. 1 990. Morphological features related to agriculture and faunal activity in three loess-derived soils in France. Geoderma 46: 329-349.
Source - M. L. Thompson

Soil Science Society of America,1993. A Reference slide collection for soil micro morphology, SSA, Madison, WI.