<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-317" name="Carbonate Ooze" parent="SC-305" scope="Substrate Subclass: Oozes that are formed primarily from the calcium carbonate-based shells of foraminifera, coccolithophores, pteropods, or other calcareous 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-331" name="Coccolithophore Ooze" parent="SC-317" scope="Substrate Group: Oozes that are formed primarily from carbonate tests of phytoplanktonic coccolithophores."/><term thcode="62" code="SC-332" name="Foraminiferan Ooze" parent="SC-317" scope="Substrate Group: Oozes that are formed primarily from carbonate tests of foraminiferans."/><term thcode="62" code="SC-333" name="Pteropod Ooze" parent="SC-317" scope="Substrate Group: Oozes that are formed primarily from the shells of pteropods (a group of planktonic mollusks)."/></nt></descriptor>