248 FLORIDA GEOLOGICAL SURVEY SIXTH ANNUAL REPORT. 



western part of Leon County (locality not specified) is taken from 

 the publication referred to. The first column of percentages is for 

 soil and the second for subsoil; but the respective depths are not in- 

 dicated. 



Mechanical Analyses of "Leon Sand," Leon County. 



Soil Subsoil 



Fine gravel (2-1 mm.) .8 .8 



Coarse sand (1-.5 mm.) 18.3 15.0 



Medium sand (.5--25 mm.) 16.5 16.2 



Fine sand (.25-.1 mm.) 37.5 37.8 



Very fine sand (.1-.05 mm.) 19.7 21.3 



Silt (.05-.00S mm.) 5.2 5.6 



Clay (.005-0 mm.) 1.5 3.1 



Total 99.5 99.8 



These figures indicate that there is little difference between soil 

 and subsoil, and that the proportion of silt and clay is rather low. 



Much of the soil is too damp for ants, gophers and salamanders, 

 but crawfish are common in some places, if one may judge from 

 their "chimneys," which are usually closed at the top, instead of open 

 like the more familiar ones in more clayey soils farther inland. 



Topograph^! and Hydrography — The surface is essentially flat, 

 except for shallow stream-channels and innumerable shallow ponds 

 and bays, and a strip of rolling country along the Sopchoppy River 

 (which has not yet been visited by the writer). It rises gradually 

 from the coast to an elevation of 75 or possibly 100 feet at its in- 

 land edge. The ground-water stands nearly everywhere within a 

 few feet or inches of the surface. 



The streams are mostly sluggish, and all coffee-colored except 

 the Apalachicola and Choctawhatchee Rivers, which are muddy. 

 These rivers fluctuate more than the smaller streams, but of course 

 not as much as they do farther inland, for near their mouths they 

 cannot rise much above sea-level. Dead Lake, or Lake Chipola, in 

 Calhoun County, seems to be a widening of the Chipola River, but 

 little is known about it, as few if any scientists have ever seen it. 



Vegetation Types — The greater part of the area is flat pine 

 woods, long-leaf pine being the most abundant tree, in spite of the 

 rather damp soil. The numerous shallow depressions contain either 

 cypress pond vegetation or bay* vegetation, or some intermediate 



*A phytogeographical term occasionally heard in this region is "bay- 

 gall"; but I have never ascertained just what difference, if any, there is 

 between a bay-gall and a bay. 



