PHOTO PATTERN DATA ELEMENTS: SANDY LAKEBED The Interior Lowlands- This low, gently rolling prairie land was formed by continental glaciation. It is characterized by level plains, beds of old lakes, small lake plains with their usual fringe forms of ridges and belts of small hills. The old lakebed with its level topography has fertile lacustrine soil (Humid) Form Plain, broad, flat. Drainage Internal, with some artificial (tile), meandering stream. Gully Characteristics Very few gullies, some sag-and-swell gullies present. Special Features Broad, flat plain; artificial drainage. Color (Photo Gray Tones) Dull gray, some lighter areas indicating coarser materials, also some mottling. Land Use Largely agricultural, small woodlots, golf course. Vegetation Agricultural crops, woodlots, scattered trees along stream. Source: Terrain analysis procedural guide for surface configuration, US Army engineer topographic laboratories, p. 7-17