To the east, alluvial fans and stream terraces descend to the river from the mountains that form the eastern boundary of the basin.

A stepped sequence of high stream terraces, present above the San Juan River and its tributaries, represents abandoned Pleistocene flood plains.

It consists of level to moderately sloping, broad ridges with stream terraces and broad floodplains.

It seems to prefer dry, rocky habitats, usually eroding stream terraces or scree slopes.

Topography is level to moderately sloping, broad ridges with stream terraces and broad floodplains.

Bama soils are mainly in level to gently sloping areas on high stream terraces paralleling major river systems and on broad marine terraces.

Generally level areas of stream terraces, paleochannels, backwater sloughs, and oxbow lakes are found within the broad Mississippi River valley.

The village is located entirely within the Sunday Creek watershed, mostly on riparian plains or old stream terraces.

Common features of the stream terrace are friable serpentine soils that are stable, not eroding, and not prone to frost heave.

The relatively level stream terraces were historically favored by settlers for home sites and to stage industrial activities.