From the Soil Micromorphology Slide Collection

Data for the horizon Horizon sampled: A3 Depth sampled: 10-23 cm
Physical and chemical data available: See reference
Micromorphological description of horizon: Framework members are banded (Brewer, 1976).
Porphyric related distribution pattern (Stoops and Jongerius, 1975). Plasma and silts aggregate to form the bands. Most of the plasma is stained by organic matter but it is not oriented relative to the bands. There are, however, a few elongated fragments of plasma that are well oriented. These latter fragments may have formed from relatively pure clay deposits. Most of the mineral grains are quartz and feldspar with some fine-grained carbonates.

Data for thin section
Preparation of sample: Air dry
Thickness of section: 30 µm
Size of Section: 25x40 mm

Soil Classification
U.S.: Fine, montmorillonitic (calcareous). Hyperthermic Vertic Torrifluvent

Elevation: 87 m above mean sea level
Legal description: 458 m E of Mohave road, about 610 m W and 15 m S of NE corner of Sec. 18,
T. 4N, R. 21W
Topography and hill slope position: Colorado River floodplain - surface 2
Parent material: Mixed alluvium
Soil climatic data and/or soil water balance: Aridic moisture regime; hyperthermic temperature
regime
Vegetation: Fourwing saltbush, mesquite, arrowweed, alkali seepweed Climate: Mean annual precipitation 8 cm; mean annual temperature 23° C

Data for 35-mm slide
Frame length: 2.7 mm
Light mode: Plane polarized

Nettleton, W.D. and J.R. Sleeman. 1985. Micromorphology of Vertisols. p. 165-196. In. L.A. Douglas and M.L. Thompson. Soil Micromorphology and Soil Classification. Soil Science Society of America Special Publication No. 15. Soil Science Society of America, 677 S Segoe Road, Madison, WI.
Source, - W. D. Nettleton

Slide RDP10. Soil Science Society of America, 1993. A Reference Slide Collection for Soil Micromorphology. SSSA, Madison, WI.