<http://caligraph.org/ontology/Precambrian_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Pre-Holocene_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://www.w3.org/2002/07/owl#Thing> .
<http://caligraph.org/ontology/Pre-Holocene_caldera>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Paleozoic_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Pleistocene_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Miocene_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Paleogene_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Mesozoic_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Pliocene_caldera>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Pre-Holocene_caldera> .
<http://caligraph.org/ontology/Pre-Holocene_caldera>	<http://www.w3.org/2000/01/rdf-schema#label>	"Pre-Holocene caldera" .
<http://caligraph.org/ontology/Pre-Holocene_caldera>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Pre-Holocene_calderas> .