Geologic Map Of Us

Geologic maps since the 1800s the usgs and its partners the state geological surveys have been producing high quality standardized geologic maps of the nation. In the united states geologic maps are usually superimposed over a topographic map and at times over other base maps with the addition of a color mask with letter symbols to represent the kind of geologic unit. Geologic maps of the 50 united states created by andrew alden from the u s.

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Geologic Map Of North America

Geological survey s geologic map of the united states 1974 by philip king and helen beikman fair use policy.

Geologic map of us. Alabama rises from the coastline its gently dipping rock layers exposing deeper and older formations in majestic order as one moves north. Geological survey and state geological surveys. There are twelve main geological provinces in the united states. Each province has its own geologic history and unique features.

Interactive database for geologic maps of the united states the u s. The color mask denotes the exposure of the immediate bedrock even if obscured by soil or other cover. This interactive tool serves as a national archive for high quality standardized geologic maps created by the u s. Pacific columbia plateau basin and range colorado plateau rocky mountains laurentian upland interior plains interior highlands appalachian highlands atlantic plain alaskan and hawaiian.

Separate geologic maps are available for alaska hawaii and puerto rico. Geological survey hosts the national geologic map database ngmdb. Geologic maps of us states digital geologic maps of the us states with consistent lithology age gis database structure and format data for the district of columbia is included with maryland. Check out the national geologic map database ngmdb which is the national archive of these maps and related geoscience reports.