Association Didymoceras et Solenoceras
Didymoceras and Solenoceras // upper Campanian // Pierre Shale formation // South Dakota
Didymoceras Nebrascense (Meek and Hayden, 1856a).
Solenoceras bearpawense (Kennedy, 2000)
upper Campanian
Pierre Shale formation
South Dakota
Didymoceras - diametre: 8 cm
Solenoceras – longueur: 7.5 cm
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Reference221



