82 
FLORIDA STATE GEOLOGICAL, SURVEY. 
Fla. State Engrs. (Engineers of the Florida State Drainage 
Commission) ; A. N. R. R. (Apalachicola Northern Railroad) ; 
A. C. L- R. R. (Atlantic Coast Line Railroad) ; C. H. & N. Ry. 
(Charlotte Harbor and Northern Railway) ; F. E. C. Ry. (Flor¬ 
ida East Coast Railway) ; G. F. & A. Ry. (Georgia, Florida and 
Alabama Railway) ; G. S. & F. Ry. (Georgia Southern and 
Florida Railway) ; L. & N. R. R. (Louisville and Nashville Rail¬ 
road; S. A. L. Ry. (Seaboard Air Line Railway) ; F. Ry. (Flor¬ 
ida Railway) ; Fellsmere R. R. (Fellsmere Railroad). The eleva¬ 
tion given for the towns, unless otherwise stated, is that of the 
depot of the railroad cited as authority. 
TOPOGRAPHIC MAP. 
In addition to the list of elevations, there is included in this 
report a topographic map of the State. The topography on this 
map is taken from a map previously issued by the Survey in 
cooperation with the United States Geological Survey and 
included in the Second Annual Report of the State Survey, 1909. 
The original map, which showed both geology and topography, 
was made by Geo. C. Matson, F. G. Clapp, and Samuel Sanford, 
under the direction of T. Wayland Vaughan, and formed a part 
of a report on the geology of Florida prepared by the United 
States Geological Survey, in co-operation with the Florida State 
Geological Survey. The base map, however, has been redrawn and 
revised by the addition of new railroads and new counties. The 
scale has been reduced one-half linear and much of the detail of 
the base map omitted. To this base there has been added the 
outline of the hard rock and land pebble phosphate formations, 
and the areas of artesian flow in the State. 
EXPLANATION OF THE TOPOGRAPHIC MAP. 
The topography is shown by means of contours. These are 
lines so placed as to pass through points all of which have the 
same altitude. On this map the contour lines are printed in 
brown and are placed at 50 foot intervals of elevation. Each 
contour represents a definite level above sea and is so marked. 
The coast line itself may be regarded as the zero contour. In 
