http://www.purl.org/ontogeonous/geologic_unit http://www.purl.org/ontogeonous/geologic_association http://www.purl.org/ontogeonous/geologic_event http://www.purl.org/ontogeonous/geologic_structure http://www.purl.org/ontogeonous/geologic_feature http://www.purl.org/ontogeonous/geomorphologic_feature http://www.purl.org/ontogeonous/external_vocabularies http://www.purl.org/ontogeonous/properties