Topographic Sketch Map

Date: 1902


Description: This is a map of the Missouri River Valley, showing the different sedimentary deposits in the region. There are three main types of sedimentary rock in this area.  First is sandstone, which is largely overlain by mud and silt from the river. Thus areas where sandstone is marked on this map are fertile agricultural areas. Next is shale, which is very important in this region because it is known to contain deposits of lignite, a very cheap brand of coal. Lastly are the copious amounts of limestone deposits, which mostly overlain by loess. This map came from the book Proceedings of the Academy of Science and Letters, a very distinguished scientific group based out of Sioux City.


Donor: Sioux City Academy of Science and Letters