upperBoundaryDefinition

7 triples
GPTKB property

Random triples
Subject Object
gptkb:Lochkovian_Stage First appearance of conodont Eognathodus sulcatus
gptkb:Zanclean_Stage base of the Gauss Chron (C2An)
gptkb:Cambrian_Stage_2 not formally defined
gptkb:Greenlandian gptkb:8.2_kiloyear_event
gptkb:Gelasian_Age base of the Brunhes–Matuyama magnetic reversal
gptkb:Northgrippian_Age 4.2 kiloyear event
gptkb:Maastrichtian_stage first appearance of the foraminiferan species Globigerina eugubina