Terminologies and classifications
Collections of terms often including definitions or scope notes, with some stated relationships among terms
Biocomplexity Thesaurus [ More info] Browsable online access to the CSA/NBII Biocomplexity Thesaurus developed in 2002-2003 through a partnership between the NBII and CSA as a merger of five thesauri.
Classification of natural ponds and lakes in the glaciated prairie region [ More info] Presents a wetland classification system that reflects seasonal, regional, and local variations in the environment.
Classification of wetlands and deepwater habitats of the United States [ More info] Detailed publication on the classification system for an inventory of wetlands and deepwater habitats of the United States used to describe ecological taxa and arrange them in a system useful to resource managers.
Coal Resource Classification System of the U.S. Bureau of Mines and U.S. Geological Survey [ More info] A report published jointly by the U.S. Bureau of Mines and U.S. Geological Survey giving definitions of coal resource classification terms.
Coal Resource Classification System of the U.S. Geological Survey [ More info] The classification system by which coal is classified into resource/reserve base/reserve categories on the basis of the geologic assurance of the existence of those categories and on the economic feasibility of their recovery.
Compilation of various geologic time scales [ More info] Preliminary report comparing various geologic time scales. Text is HTML or plain text format, and colored compilation chart in Excel format.
Divisions of Geologic Time - Major Chronostratigraphic and Geochronologic Units [ More info] A summary of the divisions of geologic time intended to provide a consistent time scale to be used in communicating ages of geologic units in the United States.
Earthquake glossary [ More info] Dictionary of terms associated with earthquakes with simple definitions and photographs especially suited for students.
Fossils, rocks, and time [ More info] Booklet describes how paleontologists use the identification of fossils to recognize rocks of the same or different ages.
Geologic glossary for National Parks [ More info] Geologic glossary containing simplified definitions for technical terms used within the USGS/National Park Service website on national parks.
Geologic time online edition [ More info] Booklet giving general explanations of geologic time, major divisions of geologic time, relative and radiometric time scales, index fossils, and the age of the earth.
Geologic time scale bookmark [ More info] This printable bookmark was designed for use with USGS activities at the 2nd USA Science and Engineering Festival, held April 26-29, 2012.
Geologic time scale chart [ More info] Chart of the geologic time scale with references.
Glossary of glacier terminology: a glossary providing the vocabulary necessary to understand the modern glacier environment. [ More info] An illustrated glossary of terms relating to modern glaciers and glacial landforms based mainly on Alaskan examples.
Glossary of terms in paleontology [ More info] Dictionary of terms associated with paleontology with brief definitions.
Glossary of water-use terminology [ More info] Dictionary of terms associated with water use from the publication: Estimated Use of water in the United States in 1990.
How to Use the Marine Realms Information Bank (MRIB) Digital Libraries [ More info] A step-by-step guide to conducting topical, geographic, and keyword searches of MRIB; viewing and refining search results; and exporting the results in several formats.
Hydrologic unit maps [ More info] Overview of hydrologic unit maps adapted from USGS Water-Supply Paper 2294 giving description of hydrologic units, link to list of hydrologic units, paper maps and digital spatial data sets.
Improving access to metadata using keywords from controlled vocabularies [ More info] Description of the use of Place Keyword Assistant, a software tool, for tagging metadata with geographic names from standardized lists or controlled vocabularies. Includes instructions on use and downloading software files.
National Geologic Map Database Geologic Names Lexicon GEOLEX [ More info] Search tool for locating lithologic and geochronologic unit names for geologic studies.
Photo glossary of volcano terms [ More info] Illustrates and describes commonly used volcano-related terms.
Precambrian Time - The Story of the Early Earth [ More info] Explains what we know about the early history of the earth and how we study the deposits formed during that time to understand the formation of the earth and life.
Standardized National Vegetation Classification System [ More info] Document on the National Vegetation Classification Standard with information on applications, background, development, characteristics, nomenclature standards, relationship to other classifications, and how to do vegetation mapping.
Vegetation sampling and classification of Great Smoky Mountains National Park (Cades Cove and Mount Le Conte quadrangles): final report [ More info] Report of a pilot study to classify vegetation communities in parts of the Smoky Mountains National Park by sampling vegetation in selected areas with information on field methods and data analysis and lists of communities identified.
Visual Glossary - asthenosphere [ More info] The asthenosphere is the ductile part of the earth just below the lithosphere, including the lower mantle. The asthenosphere is about 180 km thick.
Alphabetical Index of Topics
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