In recent years there has been growing concern about deterioration of the overall living environment of the Twin Cities Metropolitan Area. Many private citizens and governmental groups are suggesting ways to alleviate this blight. However, few have recognized the substantial influence of geologic factors on the local environment. The overall interlocking, interdependent environmental system is literally built on a geologic framework. This booklet seeks to describe the present status of knowledge of the physical controls and restraints of the environmental system excluding the climate. These physical elements include the type of soil available for raising food and fiber and the materials through which surface and ground waters flow and into which we dispose our wastes. Geologic factors also bear heavily on the nature of the materials in, on, and from which we construct our buildings and other engineering works. Natural physical hazards such as earthquakes, landslides, and floods are easily 0bserved geologic events. The mineral resources of the Twin Cities do not include economic deposits of gold, silver, or diamonds, nor is the landscape underlain by thick beds of coal or large pools of oil and gas. But beneath the hills, valleys, and lakes is an abundance of the rather mundane but important materials needed to support life and to build the needed facilities of the post-industrial age. Probably the most important of the Twin Cities' mineral resources is the plentiful supply of water. Also the rolling hills and gently sloping plains, the stream valleys, and the lake basins-the landscape -are important and unique natural resources, the base of our past, present, and future economic and cultural growth.
Educational Series 5. Environmental Geology of the Twin Cities Metropolitan Area.
Minnesota Geological Survey.
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