<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31478239</termId><termName>Aquia Creek sandstone</termName><termType>PT</termType><termNote><![CDATA[ A brown to light-gray siliceous sandstone from Aquia Creek in Stafford County, Virginia. It contains rounded, coarse to fine grains of quartz as well as scattered pebbles and clay pellets as big as 1 inch in diameter; it splits easily in any desired direction. Aquia Creek sandstone was one of the important building stones in early Washington, D.C. ]]></termNote><termCreatedDate>2026-03-30 21:08:47</termCreatedDate><relation><relationType>UF</relationType><termId>31478240</termId><termName>Aquia sandstone</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31478241</termId><termName>Virginia freestone</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31478242</termId><termName>freestone, Virginia</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31478243</termId><termName>sandstone, Aquia</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31478244</termId><termName>sandstone, Aquia Creek</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31471289</termId><termName>siliceous sandstone</termName><termType>PT</termType></relation></term>  </Zthes>