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. CUMULATIVE PERCENTAGE COMPOSITION Fig. 133. Cumulative percentage composition of mammalian distributional areas attributable to each areo- graphic faunal element. The Campestrian element predominates in three of four Great Plains faunal districts. Eastern and Neotropical elements are present only in the South Platte and Arkansas Valley faunal districts. The Eastern element is more important in the former district than in the latter, but Chihuahuan species are more prominent in the Arkansas drainage. In the Colorado Plateau Faunal Area and the Raton Faunal District, Chihuahuan and Yuman eleme

. CUMULATIVE PERCENTAGE COMPOSITION Fig. 133. Cumulative percentage composition of mammalian distributional areas attributable to each areo- graphic faunal element. The Campestrian element predominates in three of four Great Plains faunal districts. Eastern and Neotropical elements are present only in the South Platte and Arkansas Valley faunal districts. The Eastern element is more important in the former district than in the latter, but Chihuahuan species are more prominent in the Arkansas drainage. In the Colorado Plateau Faunal Area and the Raton Faunal District, Chihuahuan and Yuman eleme Stock Photo
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The Bookworm Collection / Alamy Stock Photo

Image ID:

MCKP67

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14.3 MB (819.1 KB Compressed download)

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2247 x 2224 px | 38 x 37.7 cm | 15 x 14.8 inches | 150dpi

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. CUMULATIVE PERCENTAGE COMPOSITION Fig. 133. Cumulative percentage composition of mammalian distributional areas attributable to each areo- graphic faunal element. The Campestrian element predominates in three of four Great Plains faunal districts. Eastern and Neotropical elements are present only in the South Platte and Arkansas Valley faunal districts. The Eastern element is more important in the former district than in the latter, but Chihuahuan species are more prominent in the Arkansas drainage. In the Colorado Plateau Faunal Area and the Raton Faunal District, Chihuahuan and Yuman elements have their greatest impor- tance. The former element is prevalent in each distributional unit, although of minimal importance in the Rocky Mountain Faunal Area. San Luis Valley and Wyoming Basin faunal units are comparable in having no clearly predominant faunal element. In the case of the San Luis Valley, this seems to me to re- flect the derived nature of the faunal assem- blage, with xeric-adapted species of diverse affinities accruing to a specialized and dis- tinctive local fauna. In the Wyoming Basin, on the other hand, one would imagine a priori that Great Basin and (to a lesser extent) Campestrian species should predominate. The

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