Foraminifera source details
Cushman, J.A. 1949. The foraminiferal fauna of the Upper Cretaceous Arkadelphia Marl of Arkansas. U. S. Geol. Survey Prof. Paper 221-A: 1-10.
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Gaudryinella pseudoserrata var. extensa Cushman, 1949 † accepted as Gaudryinella pseudoserrata subsp. extensa Cushman, 1949 † (original description)