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| | Chapter 17-Ecological Subregions of the United States |
 | | The predominant landforms are irregular, shallow to moderately dissected plains of alluvial origin formed by deposition of continental sediments onto a submerged, shallow continental shelf, which was later exposed by sea level subsidence. |
 | | Numerous species of otherwise common animals are nearly or completely absent from the limestone region: a few examples include the golden mouse; longtail, seal, northern dusky, four-toed, and northern red salamanders; wood and southern leopard frogs; upland and mountain chorus frogs; five-lined and ground skinks; fl kingsnake, timber rattlesnake, and brown and northern redbelly snakes. |
 | | The Section is a maturely dissected, upland plateau where broad, steep-sided bedrock ridges and "mounds" up to 500 ft (150 m) high are separated by wide, flat-bottomed drainages in the southern portion of the Section, and by narrow, V-shaped valleys farther north. |
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