Geologic Maps - Geologic maps use a combination of colors, lines, and symbols to depict the relative age, composition, and relationships among rocks and sediments at and near the earth's surface.

Geologic Hazard Maps - Geologic hazards maps show areas that may be subject to the adverse geologic effects of earthquakes, landslides, debris flows, rock falls, poor soil conditions, or floods. The main purpose of geologic hazards maps is to identify where site-specific geologic hazards evaluations are needed to assess hazards and recommend risk-reduction measures prior to development.

Geologic Resource Maps - Mineral resources are rocks and minerals that are extracted or "mined" from the earth and used for human's benefit. Geologic resource maps show where these mineral resources are located; mine-location maps show where the mines are located. The mine-location map shows the status of each mine and to what segment of the minerals industry it is assigned. Accompanying each mine map is a table that contains some basic information about each mine.

Ground Water Maps - Ground-water maps include ground-water-quality classification maps and ground-water recharge-area and discharge-area maps. Ground-water-quality classification is based primarily on the total amount of dissolved solids in the water. Ground-water-quality classification maps show different classes of water in an underlying aquifer (source of underground water). Ground-water recharge- and discharge-area maps show the relative vulnerability of underlying aquifers to surface sources of potential pollution based primarily on the presence or absence of protective fine-grained layers (sediments or rocks) and water levels in wells completed in the aquifer.

Topographic Maps - Topographic maps show the 3-dimensional surface of the earth on 2-dimensional paper using elevation-contour lines. Contour lines join points of equal elevation above a specified reference, such as sea level. Topographic maps give direction, location coordinates, scale, and description of features, such as roads, trails, rails, canals, streams, towns, political and geographic boundaries. Symbols on the map represent buildings, water tanks, mines, picnic sites, and other small features not to scale.

GIS Maps - GIS (Geographic Information System) data allow the user to create specialized maps in a computer environment by clipping the data to desired boundaries, stacking the data with other GIS data layers such as mineral resources, energy resources, cultural features, geologic units, or topographic features; or removing unneeded data. GIS data requires specialized software, which must be purchased or downloaded separately.