Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 190-191
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records for units 2 and 3. Although the Clarkforkian records the earliest first-order immigration episode in the history of North American land mammals, it is soon superseded by an even larger episode.
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From page 191... ...
It is unfortunate that this important turnover interval is not well documented by continuously fossiliferous sedimentary sequences. The Duchesnean land mammal age is marked by a major faunal turnover episode, including the last appearances of such archaic groups as Condylarthra, Tillodontia, and Dinocerata.
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