<descriptor thcode="1"><thesaurus thcode="1" name="Common geographic areas" scope="Names and identifiers of commonly-known geographic areas including oceans, continents, countries, states and provinces in North America, counties in the United States, USGS map quadrangles, and hydrologic units, nested and cross-referenced by overlap." creator="U.S. Geological Survey" rights="Public domain" edition="1.0" date="2002-03-21" codetype="alpha" prefix="geo" uri="http://www.usgs.gov/science/CommonGeographicAreas" tblname="geo" nonpref="geonp" relterm="geort" root_code="root" contact="pschweitzer"><category><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="30" name="ambiguous labels" parent="26" scope="A given preferred label may be used for more than one concept in the thesaurus. A concept must be specified using its unique identifier (code). This may occur in the names of places or people."/><term thcode="25" code="4" name="place" parent="2" scope="Terms indicate extent in space, typically by reference as the names of geographic areas known from information that is stored elsewhere."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="13" name="transitive" parent="12" scope="Narrower terms have an &quot;is a&quot; relationship with their broader terms, and generally can be described as part-of, type-of, or instance-of the broader term."/><term thcode="25" code="30" name="ambiguous labels" parent="26" scope="A given preferred label may be used for more than one concept in the thesaurus. A concept must be specified using its unique identifier (code). This may occur in the names of places or people."/><term thcode="25" code="4" name="place" parent="2" scope="Terms indicate extent in space, typically by reference as the names of geographic areas known from information that is stored elsewhere."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/></category><altlabel><altlabel>Augmented FIPS 10-4 and FIPS 6-4</altlabel><altlabel>Augmented FIPS 10-4 and FIPS 6-4</altlabel><altlabel>CommonGeographicAreas</altlabel><altlabel>CommonGeographicAreas</altlabel></altlabel></thesaurus><term thcode="1" code="ar400" name="Carbonate-rock aquifers" parent="art" scope="aquifer rock type"/><bt><term thcode="1" code="art" name="(aquifer rock types)" parent="aroot" scope="Generalized rock types of aquifers"/><term thcode="1" code="aroot" name="US Aquifers" parent="fUS" scope="Aquifers of the 48 conterminous United States, Hawaii, Puerto Ri"/><term thcode="1" code="fUS" name="United States" parent="fLD10" scope="country"/><term thcode="1" code="fLD10" name="North America" parent="fLD" scope="continent"/><term thcode="1" code="fLD" name="Land" parent="root" scope="continent"/><term thcode="1" code="root" name="Earth" scope="Common geographic areas focused on the US"/></bt><rt><term thcode="1" code="a407" name="Arbuckle-Simpson aquifer" parent="aroot" scope="aquifer"/><term thcode="1" code="a401" name="Basin and Range carbonate-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a414" name="Biscayne aquifer" parent="aroot" scope="aquifer"/><term thcode="1" code="a406" name="Blaine aquifer" parent="aroot" scope="aquifer"/><term thcode="1" code="a418" name="Castle Hayne aquifer" parent="aroot" scope="aquifer"/><term thcode="1" code="a413" name="Floridan aquifer system" parent="aroot" scope="aquifer"/><term thcode="1" code="a420" name="Kingshill aquifer" parent="aroot" scope="aquifer"/><term thcode="1" code="a416" name="New York and New England carbonate-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a411" name="Ordovician aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a405" name="Ozark Plateaus aquifer system" parent="aroot" scope="aquifer"/><term thcode="1" code="a417" name="Piedmont and Blue Ridge carbonate-rock aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a419" name="Puerto Rico North Coast Limestone aquifer system" parent="aroot" scope="aquifer"/><term thcode="1" code="a402" name="Roswell Basin aquifer system" parent="aroot" scope="aquifer"/><term thcode="1" code="a410" name="Silurian-Devonian aquifers" parent="aroot" scope="aquifer"/><term thcode="1" code="a412" name="Upper carbonate aquifer" parent="aroot" scope="aquifer"/></rt></descriptor>