The publication of the paper on the Aftonian Mammalian Fauna, in the Bulletin of the Geological Society of America, volume XX, pages 341-356, has very naturally elicited a number of questions which, however, bear chiefly on two points: First, are we certain as to the precise age of the gravels? And second, are we certain that the mammalian remains described may not be older than the Aftonian?
Proceedings of the Iowa Academy of Science
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"The Aftonian Age of the Aftonian Mammalian Fauna,"
Proceedings of the Iowa Academy of Science, 17(1), 177-180.
Available at: https://scholarworks.uni.edu/pias/vol17/iss1/24