From the Soil Micromorphology Slide Collection

Description of slide: The aggrotubule (0.3 mm in diameter) is smooth walled and appears to black a channel. The fecal material (from an earthworm) is mostly silt and clay, has less birefringence than the surrounding fabric. The surrounding RDP is porphyric. The plasmic fabric is moskelsepic.

Data for the horizon
Horizon sampled: 2Bt1
Depth sampled: 52-92 cm
Macromorphological description of horizon: 5 Y 6/2 silty clay loam; 5 Y 7/2 dry;moderate fine prismatic structure; many fine roots throughout; 10YR 4/3 stains on root channels or pores; I0YR 7/2 lime or carbonates on ped faces.

Data for thin section
Preparation of sample: Air dry
Thickness of section: 30 µm

Soil Classification
U.S.: Fine, mixed, thermic Typic Argiaquoll

Legal description: 610 m west and 8 m south of the northeast corner of section 1 4, T23S, RI 5W Physiographic position: Upland
Topography and hill slope position: Shoulder of crested hill; 2% concave, southeast facing slope Parent material: Eolian sands over finer sediments
Soil climatic data and/or soil water balance: Mean annual precipitation 6300 mm, aquic moisture regime
Vegetation: Cropland

Data for 35-mm slide
Magnification: 25 X
Light mode: Plane polarized (BF 1 5); cross polarized (BF 1 6)

Unpublished data from the National Soil Survey Lab, Lincoln NE. Source - W. D. Nettleton

Slides BF15 and BF16. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.