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USGS · fs14900

Water-quality assessment within a drainage control district in southeastern Florida

Abstract

The U.S. Geological Survey (USGS) began an extensive ground- and surface-water quality study in July 1989 to define the baseline water quality within a southeastern Florida drainage district and to develop a data base for future water-resource planning and management. Results were published in a USGS report (Lietz, 1996), comparing ground- and surface-water quality data (1989-94) to the Florida Department of Environmental Regulation Class I drinking-water standards. This Fact Sheet presents an additional 4 years of water-quality data and summarizes water-quality trends over the entire 10-year sampling period (1989-98) for selected sites and constituents.

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BibTeXRIS

A.C. Lietz. 2001. Water-quality assessment within a drainage control district in southeastern Florida. https://doi.org/10.3133/fs14900

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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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