Ackmore to Zwingle Home Series Names cf. Gunder Member Oxidized (Light-Colored) Sediments:(usually early-middle Holocene in age)
- Brown, yellowish brown, or grayish brown loamy sediments that grade to sand and gravel at depth
- Poorly drained facies may exhibit reduced colors at depth
- Unit lacks stratification except in the lower, coarser part
- Plant material (leaves, wood, stems, charcoal) is common in lower part
- Moderately well-developed soils, formed into upper part, have well-expressed B and E (subsoil) horizons.
- Unit is usually found beneath low terraces slightly elevated above modern floodplains.
- 2B and 2C horizons in some series may form in older glaciofluvial sediments.
- The surface expression of the terrace is often subdued because of an overlying mantle of Camp Creek Member sediments.
- Radiocarbon ages from the unit range from about 10,500 to about 3,000 years before present.
- NRCS Map Units with these series are on stream terraces, floodplains, footslopes,
alluvial fans.