The geologic units show a modeled distribution of surface and subsurface sediment types along or near to the selected cross sections as organized by geologic origin and relative age. Unit Qu includes all undifferentiated Quaternary sediment (till and bedded clay, silt, sand and gravel) shown in areas where control data are scarce or absent. Water is also shown where significantly sized lake basins intersect the cross section lines. Prominent physical and cultural features (rivers, towns and major highways, etc.) are labeled. MGS rotary-sonic drill holes are shown for key subsurface stratigraphic control. MGS, USGS, Anoka County, and MnDOT auger borings logs, water-well drillers logs and cuttings, and outcrop data locations and depths were also used for subsurface stratigraphic control.