2. WKST KJ.OKIDA LIME-SINK REGION. JO I 



2. WEST FLORIDA LIME-SINK OR CYPRESS POND 



REGION. 

 (figures 43-48) 



References- Harper i (219), Matson & Clapp (57-58, 145), Matson & 

 Sanfnrd (78, 325-329), Sellarcls 1 (67-68), Sellards & Gunter 3 (111-113) 

 Smitli 2 (224, 225), and U. S. soil survey of the "Marianna area." Illus- 

 trated in 2nd Ann. Rep-, pi. 2.2; 4th Ann. Rep., pi. 13.2, 15.2, 15.3, 16.1, 16.2. 



This region embraces about 1,600 square miles in West Florida, 

 and extends northeastward through Alabama into Southwest Geor- 

 gia, if not all the way across the latter state. The boundary between 

 it and the red lands just described is pretty sharp in some places, but 

 not everywhere. 



Geology and Soils — This region, like the first, is everywhere un- 

 derlaid by the Vicksburg limestone, which is exposed in only a few 

 places, mostly along streams and in sinks, though there is no telling 

 how much of the clay that conceals the rocks is residual from the 

 same formation. Over the Vicksburg limited areas of the Chatta- 

 hoochee formation have been recognized. Rock Hill, about 4 1-2 

 miles southeast of Chipley,* is capped by a mottled argillaceous 

 sandstone which appears to be identical with the xVltamaha (irit of 

 Georgia, and on its southern slope are large boulder-like masses of 

 blackish ferruginous sandstone, which have been referred to the La- 

 fayette formation. The mottled sandstone is not known to occur 

 elsewhere in Florida, and the blackish rock is much more common 

 a little farther north. 



The soil is mostly a few inches or feet of grayish sand or sandy 

 loam, passing downward into reddish or mottled sandy clay or 

 clayey loam many feet thick, which may be a comparatively recent 

 formation (Lafayette), though in some places it is evidently derived 

 from the weathering of the underlying Tertiary strata. Where the 

 clay is near the surface the ground is often thickly strewn with fer- 

 ruginous concretions or nodules an inch or less in diameter, making 

 what is commonly called "pimply"' land, and now considered very 

 desirable for agricultural purposes. There is nearly everywhere 

 enough sand to make plowing easy in any kind of weather, and to 

 keep the roads from getting muddy. 



No chemical analyses of soils from this region are available; but 

 in that part included in the "Marianna area" the most extensive 



*For descriptions of this locality see Matson & Clapp (145, pi. 7.1). 

 Harper 2. Matson & Sanford (150, pi. 12..A.) 



