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PHOTO PATTERN DATA ELEMENTS: ALLUVIAL FAN The Basin and Range Province- This desert region is an area characterized by blockfaulted mountains and adjacent basins, some below sea level. Sediments flow off the tilted blocks and form sloping, layered deposits of coarse-to-fine alluvium. Erosion causes troughs to form in the surface of these layered deposits. (Arid) Form Fan, series of fan-shaped deposits sloping to a valley along a mountain front. The materials grade from gravel to sand to silt downslope. Drainage Dendritic where developed- drainage absent on most deposits. Gully Characteristics Sharp, V-shaped gullies with steep gradients. Special Features Coalescing fans form almost continuous sloping surface. Color (Photo Gray Tones) Light grays indicate sorted granular materials. Dark pattern due to vegetation. Land Use Agriculture developed on the porous fans. Wind erosion occurs if vegetation does not anchor the soil. Vegetation Plants are restricted to area containing porous materials which have groundwater. Source: Terrain analysis procedural guide for surface configuration, US Army engineer topographic laboratories, p. 7-43
