...The living species of pygmy mice resulted from a geographicseparation, perhaps occurring in the Iowan glacial period (See DeTerra, 1949:51) in the transverse volcanic zone of central México...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...The lower Platte River developed and the surface drainagebecame distinct in the Iowan (Tazwellian) portion of the Wisconsinglacial stage (Lugn, 1935:152-153)...
W. L. Minckley 「Fishes of the Big Blue River Basin, Kansas」
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