SOIL SURVEY OF BRADFORD COUNTY, FLORIDA. 267 
paratively little cost, be converted into land suitable for intensive 
agriculture. A general system of drainage is being inaugurated in 
the county, and should mark the beginning of a larger development 
along agricultural lines. 
SOILS. 
Bradford County lies wholly within the Coastal Plain, and its 
soils, with the exception of those which occupy the flood plain of 
streams or occur around some of the lakes and the Peat and Muck 
beds, are derived from 1 old marine sediments. Since the elevation 
of the region above sea level, weathering has effected some changes 
in the deposits, and erosion has in places altered the original surface 
configuration. 
The numerous sink holes in the southwestern part of the county 
are attributed to the solution and caving in of the underlying Vicks¬ 
burg limestone. Although this limestone occurs beneath the whole 
county, it is too deep to have contributed any material to the forma¬ 
tion of the soils, and is important only as it has influenced the topog¬ 
raphy and altered the drainage conditions. 
Covering the limestone are unconsolidated deposits of varying 
thickness. A very close relationship exists between the nature of 
these underlying beds and the soils derived from them. Where the 
parent formation is a deep sand bed, naturally the resulting soil is a 
sand, and where the particles in the original formation are fine the 
soil derived from it is correspondingly fine in texture. The more 
clayey beds give rise to the sandy loams and fine sandy loams, the 
texture depending on the predominance of one or the other grade of 
included sand. 
The soils of the county fall into three broad groups, according 
to their origin and mode of formation. They are sedimentary—and 
this group comprises the greater part of the area—alluvial, and 
cumulose. Each of these broad groups is subdivided into series and 
types. The series include soils of similar derivation, color, drainage, 
topography, and character of subsoil. 
The type differentiation within any series is based entirely upon 
the texture or relative proportion of soil particles of the different 
grades or sizes. There are 5 series and 10 types of soils in the sedi¬ 
mentary group, 1 series of 2 types in the alluvial group, and 2 types 
in the cumulose group. The Norfolk, Leon, Scranton, Coxville, and 
Portsmouth series are in the first group and the Johnston in the 
second. 
