<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31322797</termId><termName>thin sections</termName><termType>PT</termType><termNote><![CDATA[ Refers to very thin sections of a petrographic sample ground down to a flat surface and prepared for examination by a microscrope or microprobe. A thin section is 30 microns or less in thickness as a rule.   ]]></termNote><termCreatedDate>2026-03-30 20:27:01</termCreatedDate><relation><relationType>UF</relationType><termId>31322798</termId><termName>petrographic thin sections</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31322799</termId><termName>sections, thin</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31322800</termId><termName>thin section</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31307094</termId><termName>sections</termName><termType>PT</termType></relation></term>  </Zthes>