Human history unfolds on a platform of rocks, loose sediment, and soil. Planning and management decisions, in connection with highway construction and maintenance, water supply evaluation, waste disposal, geologicÊhazards, mining, reclamation, and land management in general, should be based on suitable geological information. The environmental geology map shows major rock and sediment types that are, or may be, important in terms of environmental matters such as probable rainfall insoak, availability of construction materials, and strength of the rock or sediment foundation.
