Extent of Program National Available Product Coverage Random. These sources are available at Earth Science Information Center offices, in USGS libraries, and may be available at other earth science libraries, such as those of universities. The publication scale is the same as that of the topographic base. All geologically significant units at the publication scale are shown, and geologic features are depicted uniformly throughout the area of the map. The dip and direction of relative movement of faults are indicated where known.
Some maps show structure contours.
GQ-Series maps portray both bedrock units and surficial units. Maps that meet these criteria but do not portray the bedrock geology are termed surficial geologic maps. If the map portrays only the bedrock units it is termed a bedrock geologic map. A GQ-Series map is accompanied by an explanation that describes the distinctive characteristics and principal variations in the map units. Stratigraphic nomenclature is consistent with the Code of Stratigraphic Nomenclature.