BGS Lexicon of Named Rock Units
has equivalence description

http://data.bgs.ac.uk/ref/Lexicon/equivalenceDescription
Comment"Property describes the equivalence between the two rock unit names or rock unit entities" language=en 
Label"has equivalence description" language=en 
Rangehttp://www.w3.org/2000/01/rdf-schema#Literal
Typehttp://www.w3.org/1999/02/22-rdf-syntax-ns#Property

namespaces used
bgsrBGS Schemas
bgsreBGS RCS Earth Material Classes
bgsrgBGS Geochronology
bgsrlBGS Lexicon of Named Rock Units
bgsrmBGS 1:625 000 Digital Geological Map
dctDublin Core terms
rdfResource Description Framework
rdfsResource Description Framework - Schema
skosSimple Knowledge Organization System
xsdXML Schema Data Type