<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-360" name="&lt;i&gt;Coquina&lt;/i&gt; Rubble" parent="SC-340" scope="Substrate Subgroup: Clam Rubble (with a median particle size of 64 millimeters to &lt; 4,096 millimeters) that is primarily composed of cemented or conglomerated Coquina shells."/><bt><term thcode="62" code="SC-340" name="Clam Rubble" parent="SC-320" scope="Substrate Group: Shell Rubble (with a median particle size of 64 millimeters to &lt; 4,096 millimeters) that is primarily composed of cemented or conglomerated clam shells."/><term thcode="62" code="SC-320" name="Shell Rubble" parent="SC-306" scope="Substrate Subclass: Substrate that is dominated by living or non-living shells forming Rubble, with a median particle size of 64 millimeters to &lt; 4,096 millimeters in any dimension (Cobbles and Boulders). ..."/><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-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></descriptor>