Elevation can be an important factor for understanding biotic distribution.
Elevation can be used to contrast adjacent map units. For example, a sub-subdistrict of lake plain will generally be very flat and poorly drained. A sub-subdistrict of end moraine will have steeper, more irregular topography, characterized by better drainage conditions. Area is listed in acres and hectares. The states in which the section, subsection, or sub-subsection occurs are listed here.