Geofacets-SEG Millennium Edition

Geofacets-SEG Millennium Edition is an exclusive feature customized for SEG members to access scientific maps published in Economic Geology from 2000 to present. This intuitive interface enables an efficient assessment of a region's geologic characteristics and mineral potential, and will serve as a strong complement to our existing archive of more than 9,000 articles of Economic Geology.

Previously offered as a paid subscription, Geofacets is now a benefit of SEG membership. For more information, please read the FAQs below.

SEG Member Access

Product Overview

Webinar Slides

Geofacets Webinar Slides

Press Release and FAQs

Elsevier and the Society of Economic Geologists Deliver 107 Years' Worth of Scientific Maps through Geofacets. Read the Elsevier Press Release, September 20, 2012.

What is the cost?

Beginning January 2019, Geofacets will be included in all SEG membership categories.

How do I access Gefoacets content?

Visit and click the "SEG Member Access" button. (You must perform this step each time to access Geofacets -- you cannot sign in directly at If you are not already logged in you will be prompted to enter your SEG member credentials. Please allow a few moments to establish your connection to Geofacets.

Can I access Geofacets from anywhere?

Yes. Geofacets is a web-based application that can be accessed from anywhere with an Internet connection.

Do I need to download special software to use Geofacets?

No special software is required. Geofacets supports Firefox, Chrome, Safari, and Internet Explorer (IE) 7 or higher; Javascript must be enabled.

Will Geofacets work on a Mac?

Yes. Geofacets is compatible with both the Safari and Firefox browsers on a Mac.

What browsers does Geofacets support?

Geofacets supports Firefox, Chrome, Safari, and Internet Explorer (IE) 7 or higher; Javascript must be enabled.

Is content other than maps available in Geofacets?

Yes. The value of Geofacets lies not only in access to the maps included in Economic Geology, but also in access to the contextual information for the map made available in a full-text, read-only PDF of the associated journal article.

Why are some of the maps not georeferenced?

While all maps from Geofacets are downloadable as TIFF or JPEG files, there are a few possible scenarios for why maps found in Geofacets could not be georeferenced:

  • If a map is hand-drawn with errors introduced, which is common to maps generated prior to the mid-1990's when computers were not regularly used to generate maps
  • If a map's scale cannot be determined or the scale is distorted
  • If our modern day coordinate system does not apply to a map, i.e., for paleogeographic maps which depict geographic locations and movement of continents through geologic time
  • If a map's geographic coordinate system or projection cannot be determined
  • If a map has no geographic coordinates and/or geographic identifiers (e.g., countries, cities, states, etc) that can be used as a reference point

Can I integrate my own maps and data with Geofacets content?

Yes. You can integrate Geofacets content with your own proprietary data and maps by downloading and importing our maps into external software programs. Download GeoTIFF files to integrate into a GIS program, KMZ files to integrate into Google Earth, and JPEG files to integrate into PowerPoint or similar presentation software. Please note that not all maps are available as a GeoTIFF file or KMZ file.

Will I be able to get a PDF of a journal article that does not contain any maps?

No. Only journal articles with maps are included in Geofacets.

Can I use the maps from Geofacets in the public domain?

Geofacets users must comply with all terms of their subscription agreement and the terms and conditions associated with each map, including restrictions on republishing the original or modified maps. Any public display or republishing must be cleared by the copyright holder, however any internal use is allowed. The terms and conditions for map use may be accessed via the Detail Window.

What is the range of map surface areas/scales available?

Maps are available at a variety of scales, depending on the publication and maps the author chose to convey geospatial information.

Does a map come with a key/legend?

Maps are extracted "as is" from the articles. The extracted maps will only have a key/legend if the original map contained one. Depending on map format, you may need to view the "original image" tab in the Detail Window or the original publication

Is vector data available at this time, via Geofacets?

Georeferenced maps may be downloaded in GeoTIFF or KMZ raster image format. No content is available as vector data at this time.

How do I know that there is a sufficient level of quality control for how maps from Geofacets are georeferenced?

Maps are georeferenced by trained staff and must pass strict screening criteria to ensure proper geographic information is present before being georeferenced. The map must contain an adequate number of coordinate pairs (marked latitude/longitude intersections) and/or geographic identifiers must exist in at least three map quadrants for a map to be georeferenced. All other maps (about 25%) are geolocated (approximate map location is determined using information from the caption or title).

Georeferenced map alignment accuracy is checked by:

  • Visually comparing the alignment of map control points with a basemap.
  • Assessing the root mean square (RMS) error of the georeferenced control points compared to control point on the basemap. Lower RMS error indicates that control points on the basemap and georeferenced map are closely aligned. However, alignment error may still be present in maps with a low RMS error.
  • Comparing the measure of the scale bar to the same distance measured on the base map, if present.

Are only journals in English language referenced?

At present, the Geofacets content base contains only English language publications.

Can I search for geological cross-sections in Geofacets?

Many publications in Geofacets contain geological cross-sections. However, cross-sections are not available as an extracted image at this time. Users can refine search results to the map types: Structural, Stratigraphic Units/Deposits, Seismic Survey, and Borehole/Corehole Location as geological cross-sections are frequently located in the associated publications for these map types. Users can also perform a keyword search or keyword refinement for "cross section".

Can we create cross-sections using the maps from Geofacets?

The ability of a user to create cross-sections or other geological interpretations from Geofacets depends on the geographic area of interest and the research publications that exist in that area.