8 



BUREAU OF AMEHICAN ETHNOLOGY 



( Bull. 137 



Mountains in Virginia, West Virginia, Kentucky, Tennessee, North Caro- 

 lina, and a bit of northern Georgia (2). 

 Upper Austral Zone : 



The Carolinian Faunal Area: Including the Piedmont Plateau from the 

 Potomac River through the central parts of Virginia, and North Carolina, 

 northwestern South Carolina, northern Georgia, the northeastern corner 



Map 7. — Drought frequencies in the Southeast. Portion of a map of the Weather Bureau, 

 United States Department of Agriculture, showing the number of periods of 30 consecu- 

 tive days or more without 0.25 inch of precipitation in 24 hours during the season March- 

 September, inclusive, for the period 1805-1914. The smallest number is 6 or below, the 

 highest 33 or above. (After Paullin and Wright.) 



of Alabama, central Tennessee, and thence northward, including nearly 

 all of Kentucky and western West Virginia, as also the Ozark Plateau 

 of Arkansas (3b). 

 The Upper Sonoran Faunal Area : Not entering into the section under con- 

 sideration, but indicated in the margin of the map toward the north- 

 west (3a). 



