There are 3 matches

Collection Authorizer Collection name Reference
93225R. Butler Twin Butte Creek (= Pteranodon harpyia holotype / coll. Cope 1871) Late Santonian/Early Campanian - Kansas Cope (1872)
203740E. Vlachos near Butte Creek (= Protostega gigas type locality / coll. Cope 1871) Late Coniacian/Early Campanian - Kansas Cope (1871)
203741E. Vlachos near Elkader (coll. Martin 1897) Late Santonian/Early Campanian - Kansas Hay (1908)

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