From the Soil Micromorphology Slide Collection

Micromorphological description of slide: Coarse grains are bridged by and embedded in Fe-organic­ matter precipitate (chitonic-gefuric-porphyric related distribution pattern, according to Bullock et al., 1985; plectic to porphyric, according to Brewer and Sleeman, 1988).

Data for the horizon Horizon sampled: Bhf Depth sampled: 8-22 cm
Chemical description of horizon: OM = 15%, dithionite Fe = 1.80%, dithionite Al = 0.90%,
oxalate Fe = 1.76%, oxalate Al = 0.94%, pH = 3.96, base saturation = 56%
Particle-size distribution: Coarse fragments = 57%; sand = 37%, silt = 36%, clay = 27% (fine­ earth fraction)
Clay mineralogy: Mica and somewhat chloritized vermiculite
Macromorphological description of horizon: Reddish black (10YR 2/1 moist, 5YR 3/1 to 7.5YR 6/2 dry), stony gravelly loam, about 60% coarse fragments, moderate fine subangular blocky, firable, fine roots common

Data for thin section:
Preparation of sample: Air dry
Impregnating medium: Polyester resin
Thickness of section: 25-30 µm
Size of section: 27x46 mm
Orientation of section: Vertical

Soil Classification
U.S.: Placaquod
Canada: lronpan Humic Podzol

Environment :
Elevation: 30 m above sea level
Topography and hill slope position: 8% westerly slope
Vegetation: Sphagnum and hypnum mosses, lambkill, partridge berry, grasses and scrubby spruce and fir

Data for 35-mm slide
Frame length: 1.3 mm
Light mode: Plane-polarized

McKeague, J. A., Schnitzer, M., and Heringa, P. K. 1967. Properties of an lronpan Humic Podzol from Newfoundland. Canadian Journal of Soil Science 47: 23-32.
Source - R. Guertin


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