Click on the links below to see detailed descriptions of these maps.
Investigation Quadrangle Oil and Gas

Geologic maps use a combination of lines, symbols, and colors to show the composition and structure of earth materials and their distribution across and beneath the Earth's surface. They generally show bedrock formations like granite or limestone, surficial units such as sediment deposited by glaciers or rivers, and structures like folds and faults. Geologic maps can be used to identify geologic hazards, locate natural resources, and facilitate land-use planing.

The USGS makes many kinds of geologic maps. These maps are available as single or multiple sheets, many of which are folded and placed in a paper jacket. Other geologic maps are enclosed in envelopes bound with USGS reports such as professional paper, bulletins, and water-supply papers. The texts of these reports contain descriptive and interpretive matter that supplements the information on the geologic maps.