Lacustrine Plain

Lacustrine Plains (or lake plains) are lakes that get filled by incoming sediment. Over time, the water may drain from the lake, leaving the deposited sediments behind. This can be caused by natural drainage, evaporation or other geophysical processes.

The soil of the plain left behind may constitute fertile and productive farm land, due to the previous accumulation of lacustrine sediments. In other cases it may become a wetland or a desert.

The topography of Southern Indiana reflects a system of complex lacustrine plains. An ice sheet during the Illinoian stage changed drainage patterns in the area and formed a series of proglacial lakes. One of the more distinct lakes in this series was Lake Quincy, named for Quincy, Indiana. As the ice sheet withdrew, these lakes disappeared leaving behind the lacustrine plains that are still preserved today. Quincy Lake, in particular, left sediments 30 to 40 feet deep, and ranging from gravels to silts.

Other examples of lacustrine plains include The Kashmir Valley of India, the Imphal basin in the Manipur hills and the watershed of the Red River of the North in the USA and Canada.

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