Till plain

Till plains are common in areas such as the Midwestern United States, due to multiple glaciation events that occurred in the Holocene epoch.

This occurs where changing climate and/or ice dynamics led to multiple phases of glacier advance and retreat.

Meltwater, as well as groundwater, tends to preferentially flow through subglacial sediment deposits, given that they are sufficiently porous, soft, and deformable.

The parent material which these soils formed from varies greatly from one area to another, and is dependent on the path of the glacier which deposited the initial glacial till.

This has caused different soils to form over time, but most generally share similar properties such as a loamy texture and poor drainage if derived from glacial till.

The soils developed from till plains have become some of the most productive agricultural regions in the United States, due to the combination of thick till deposits forming rich fertile soils, and the gently rolling to flat topography being very suitable for farming practices.