From the Soil Micromorphology Slide Collection

Micromorphological description of slide: Loose clusters of rugose potworm fecal pellets; abundant packing porosity; weakly to strongly altered plant tissues.

Data for the horizon Horizon sampled: A2 Depth sampled: 3-20 cm
Physical and chemical data available: Sand = 5%, silt = 70%, clay = 22%; pH = 6.4; CEC =
21.3 cmol kg- 1 ; OC = 18 g kg-1
Macromorphological description of horizon: 1OYR 3/2 and 4/4; silt loam; moderate fine and medium subangular blocky and granular; friable
Micromorphological description of horizon: Single-space porphyric related distribution pattern (c/f20); stipple-speckled birefringence fabric; fecal pellets attributed to earthworms and potworms abundant

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

Environment:
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

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

Thompson M.L., N. Fedoroff and B. Fournier. 1990. Morphological features related to agriculture and faunal activity in three loess-derived soils in France. Geoderma 46: 329-349.
Source - M. L. Thompson

Slide MS7. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.