Ellis L. Yochelson; A Devonian aptychus (Cephalopoda) from Alabama. Journal of Paleontology ; 57 (1_Part_I): 124–127. doi:
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The Chattanooga Shale in northern Alabama has yielded part of a cephalopod aptychus. This is the first report of a Devonian aptychus in the United States and only the fourth report of aptychi in the Paleozoic of North America.--Journal abstract.
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