SOIL SURVEY OF PINELLAS COUNTY, FLORIDA. 321 
departs from the typical soil in that the usual hardpan stratum is 
not found within the 3-foot profile. 
The rolling phase is not extensive; neither is it restricted to any 
particular locality. This land stands somewhat higher than the 
Portsmouth fine sand, frequently occupying a slight elevation along 
the water front. It is locally known as “scrub,” because of the dense 
growth of spruce pine which is found in the county only upon this 
type. Scrub oak, dwarf palmetto, and rosemary constitute a thick 
undergrowth. (Figure 78.) On account of the position of the 
type and its loose, porous character, the natural drainage is excess¬ 
ive. As a result little organic matter has accumulated. The topog¬ 
raphy in places closely resembles that of the sand dunes, and its 
origin is probably due in part at least to wind action.* 
None of the Leon fine sand, rolling phase, is under cultivation, 
but it is believed that with proper management it would prove a 
desirable soil for the growing of pineapples. In the southern part 
of the State pineapples are successfully grown on soil similar to this, 
but no attempt has been made to produce them here. 
Parkwood Series. 
The distinguishing feature of the Parkwood series is the gray to 
white lower subsoil of marl. The soils are grayish to grayish brown 
in color, with subsoils of grayish-brown to grayish-yellow sandy clay 
to heavy clay loam in the upper portion, resting upon beds of marl 
at a depth of 29 inches. 
PARKWOOD FINE SANDY LOAM. 
The Parkwood fine sandy loam as mapped presents considerable 
variation. The soil as mapped in this survey consists of a black or 
nearly black fine sandy loam, being darker than usual. It is under¬ 
lain by grayish-brown to nearly white silty clay loam containing 
some calcareous material from limestone or marl. The subsoil in 
places is a mottled dull-brown and yellow plastic clay or sandy clay. 
It also in places carries a greenish-yellow material, which probably 
consists of bog-iron ore. As mapped, the type includes patches in 
which the soil varies from dark-gray fine sand to black heavy fine 
sandy loam, ranging from a few inches to about 30 inches in depth. 
Limestone or marl, with shells, occurs in places within the 3-foot 
section and occasionally outcrops. The clayey material is derived 
*In the opinion of E. H. Sellards, State geologist, the areas east of Clear¬ 
water are old sand dunes. 
