<descriptor thcode="62"><thesaurus thcode="62" name="Coastal and Marine Ecological Classification Standard" scope="Categories of ecosystems for coastal, estuarine, and marine environments." creator="FGDC" rights="public domain" date="2017-05-10" codetype="alpha" prefix="cmecs" uri="https://www2.usgs.gov/science/CMECS" tblname="cmecs" root_code="root" contact="pschweitzer"><category><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/><term thcode="25" code="16" name="hierarchical" parent="11" scope="Substantive broader-narrower relationships exist among the terms."/></category><altlabel><altlabel>CMECS</altlabel><altlabel>CMECS</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel><altlabel>Coastal and Marine Ecological Classification Standard (CMECS)</altlabel></altlabel></thesaurus><term thcode="62" code="SC-301" name="Biogenic Substrate" parent="SC-C003" scope="Substrate Origin: Substrates where percent cover of non-living Biogenic Substrate exceeds percent cover of both Geologic Substrate and Anthropogenic Substrates, when all are considered separately. ..."/><bt><term thcode="62" code="SC-C003" name="Substrate" parent="root"/><term thcode="62" code="root" name="CMECS" scope="Coastal and Marine Ecological Classification Standard: Category terms encompassing waters from the head of tide or inland incursion of ocean salinity to the splash zone of the coasts to the deepest portions of the oceans and the deep waters of the Great Lakes."/></bt><nt><term thcode="62" code="SC-302" name="Algal Substrate" parent="SC-301" scope="Substrate Class: Biogenic Substrate that is primarily composed of calcareous algae in various states of decomposition, including both crustose and coralline types."/><term thcode="62" code="SC-303" name="Coral Substrate" parent="SC-301" scope="Substrate Class: Non-living scleractinian coral reefs (or coral particles) constitute the dominant benthic substrate; this substrate may or may not be inhabited by live corals."/><term thcode="62" code="SC-305" name="Ooze Substrate" parent="SC-301" scope="Substrate Class: Deep sea substrates that are composed of &gt; 30% tests, shells, or frustules of small plankton, including diatoms, radiolarians, pteropods, foraminifera, and other marine plankters. ..."/><term thcode="62" code="SC-304" name="Organic Substrate" parent="SC-301" scope="Substrate Class: Surface layers of substrate are primarily composed of non-living organic material, including fine or coarse organic particles up to 4,096 millimeters in any dimension. ..."/><term thcode="62" code="SC-306" name="Shell Substrate" parent="SC-301" scope="Substrate Class: Biogenic Substrate that is primarily composed of shells or shell particles. Most (but not all) shell-builders are mollusks."/><term thcode="62" code="SC-307" name="Worm Substrate" parent="SC-301" scope="Substrate Class: Biogenic Substrates that are primarily composed of the cemented or conglomerated calcareous or sandy tubes of polychaetes or other worm-like fauna. ..."/></nt></descriptor>