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USGS · fs08297

The National Atlas of the United States of America

Abstract

In 1970 the U.S. Geological Survey (USGS) published The National Atlas of the United States of America™. It was a 400-page, oversized, 12-pound collection of maps. In 1998, a new and innovative National Atlas will be published. This edition will include both electronic and paper map products and will exploit information management, access, and delivery technologies that didn't exist in 1970.

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Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey. 1997. The National Atlas of the United States of America. https://doi.org/10.3133/fs08297

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Divisions of geologic time—Major chronostratigraphic and geochronologic units

Introduction The reports and maps of our Nation’s geological surveys inform and benefit the public, private industry, government officials, and scientists. The use of clear and consistent nomenclature and classifications can improve communication of data and interpretations. Since 1899, the U.S. Geological Survey (USGS) Geologic Names Committee (GNC) has been responsible for defining standards that promote uniform geologic nomenclature and classifications among geoscientists. The GNC periodically publishes a geologic time scale, the “Divisions of Geologic Time,” that serves as the national standard for USGS publications (for example, refer to Orndorff and others, 2023). Authors may use other published geologic time scales, such as those of the Geological Society of America (GSA) or the International Commission on Stratigraphy (ICS), provided that they are clearly specified and referenced. Access to the USGS, GSA, and ICS geologic time scales is also available from the U.S. Geologic Names Lexicon (Geolex) website https://ngmdb.usgs.gov/Geolex/stratres/timescales. The geologic time scale serves a dual purpose by enabling authors to distinguish earth material units by position (chronostratigraphic) and time (geochronologic), as outlined in order of decreasing rank.

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