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USGS · fs20173031

U.S. Geological Survey Science—Improving the value of the Chesapeake Bay watershed

Abstract

Introduction Congress directed the Federal Government to work with States to restore the Nation’s largest estuary. Chesapeake Bay restoration provides important economic and ecological benefits: 18 million people live and work in the Bay watershed and enjoy its benefits. 3,600 types of fish, wildlife, and plants underpin the economic value of the Bay ecosystem. Poor water quality and habitat loss threaten restoration and negatively impact the economy. 10 Goals to meet by 2025 through the Chesapeake Bay Program, a voluntary partnership.

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90° N90° S · 180° W ← longitude → 180° E
Source-reported bounding extent: 36.48314061639213° to 42.98053954751642° latitude; -80.771484375° to -74.278564453125° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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BibTeXRIS

Scott W. Phillips, Kenneth Hyer, Elizabeth Goldbaum. 2017-05-05. U.S. Geological Survey Science—Improving the value of the Chesapeake Bay watershed. https://doi.org/10.3133/fs20173031

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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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