upper boundary defined by

URI: https://gptkb.org/prop/upper_boundary_defined_by
5 triples
GPTKB property
Random triples
Subject Object
gptkb:Drumian_Stage first appearance of Lejopyge laevigata
gptkb:Stage_10_of_the_Cambrian base of the Ordovician Period
gptkb:Stage_3_(Cambrian) base of Cambrian Stage 4
gptkb:Jiangshanian_Stage first appearance of Lotagnostus americanus
gptkb:Jiangshanian_stage First appearance of Lotagnostus americanus