226 FLORIDA GEOLOGICAL SURVEY SIXTH ANNUAL REPORT. 



sand,*' a much less extensive soil of the same region. This may 

 be due in part to the abundance of salamanders, which keep the soil 

 within a foot or two of the surface pretty well stirred up. 



Topography and Hydrography — This region seems to be a little 

 higher than most of the surrounding country, but no measuremenrs 

 of altitudes are available. It might be described as a comparatively 

 level upland, pitted with many approximately circular depressions 

 varying from several acres to a few hundred acres in extent and 30 

 Ic 50 feet deep, and containing lakes. The number of lakes averages 

 perhaps one to a square mile, though in some places two or three 

 can be seen at once. Streams are comparatively scarce, but the soil 

 map of the "Marianna area" shows several branches in the north- 

 eastern portion, and Pine Log Creek traverses the region near its 

 center. As in most other very sandy regions, the seasonal fluc- 

 tuation of the water is comparatively small. 



Vegetation Types — The uplands are covered with open forests 

 of long-leaf pine, plentifully interspersed with black-jack and turkey 

 oaks, and carpeted with wire-grass and other herbs. Some of the 

 lakes are bordered by cypress, tyty, and other water-loving trees 

 ai'd shrubs, and some of the smaller depressions are completely filled 

 with vegetation of the "bay" type. Fires are frequent in the pine 

 forests, but where a steep slope going down to water gives sufficient 

 protection there is likely to be hammock vegetation. 



Plants — The following list is based on two round trips across 

 the region by rail, one on the A. & St. A. B. Ry. on June 25 and 26, 

 J909, and one on the B. C. & St. A. R. R. on May 10, 1914; and a 

 brief examination of its northern edge about three miles south of 

 Vernon on May 8, 19 14. As it represents only about three hours of 

 field work, it is doubtless far from complete; and the percentage 

 figures are omitted. 



TREES 



