From the Soil Micromorphology Slide Collection

Data for the horizon
Horizon sampled: 2C3 (llOc03)
Depth sampled: 867-882 cm
Physical and chemical data available: 2C3 (llOc03) (613-1094 cn): pH = 5.9, C = 17.4%, N =1 .2%, ash = 67.8%
Macromorphological description of horizon: 10 YR 4/2 sedimentary peat; massive.
Micromorphological description Of horizon: The soil fabric is dense with a tendency towards horizontal alignment of the following basic components: Very frequent diatoms (1 2.3%), dominantly Melosira sp.; occasional sponge spicules; abundant amorphous fine material (52.4%); frequent moderately to well decomposed organic particles (10100 that often have cell structures separating to form part of the fine material, mineral grains (2.1 %), and void space (8.2%). Rare plant tissues contain pyrite nodules. Percentage areal distributions were assessed from thin section by point counting approximately 3000 points on the thin section at 1 25x magnification.

Data for thin section
Preparation of sample: Acetone
Impregnating medium: Polyester resin
Thickness of section: 30 µm approximately
Orientation of section: Vertical

Soil Classification
U.S.: Entisol
F.A.O.: Gleysol
Canada: Limno Humisol

Elevation: 95 m above sea level
Physiographic position: Basin swamp.
Topography and hill slope position: Level
Parent material: Peat material (woody-sedge sedimentary, sedge-sedimentary and sedimentary)
Soil climatic data and/or soil water balance: Mesic mild humid (Soil Climates of Canada map (1 975))
Vegetation: Dominant vegetation in basin swamp is Spiarea douqlasii (80% cover) and Salix sp. (10% cover)

Data for 35-mm slide
Frame length: 1 .0 mm
Light mode: Plane polarized

Fox, C. A. and C. Tarnocai. 1989. The micromorphology of a sedimentary peat deposit from the Pacific temperate wetland region of Canada. p. 31 1-319. In L. A Douglas (ed.). Soil micromorphology: A basic and applied science. Proc. 8th IWMSM. Elsevier, New York.
Tarnocai, C. and Schuppli, P. 1987. Sedimentary peat in Canadian peatlands. p. 25-37. In C. D. A. Rubec and R.P. Overend (eds.) Proc. Symposium '87 Wetlands/Peatlands. Edmonton, Canada.

Slide BF36. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.