<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-318" name="Siliceous Ooze" parent="SC-305" scope="Substrate Subclass: Oozes that are formed primarily from the silica-based tests, frustules, or shells of diatoms, radiolarians, or other siliceous plankton. ..."/><bt><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-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. ..."/><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-334" name="Diatomaceous Ooze" parent="SC-318" scope="Substrate Group: Oozes that are formed primarily from the silica-based frustules or tests of phytoplanktonic diatoms."/><term thcode="62" code="SC-335" name="Radiolarian Ooze" parent="SC-318" scope="Substrate Group: Oozes that are formed primarily from the silica-based tests of amoeba-like radiolarians."/></nt></descriptor>