GEOLOGY CHlOCTAWHATCHEE AND APALACHICOLA RIVERS. 8 1 
About two miles west of River Junction in the triangle formed by three 
blazed trees; one of which is a 20-inch white oak, distant 20 feet; another is 
a 24-inch post oak, distant 100 feet; and the other is a 10-inch walnut, distant 
127 feet. The bench mark is a copper bolt in a concrete post, ico meters 
southwest of the west concrete pier at the west end of the Louisville and 
Nashville railroad bridge over the Apalachicola river and about 3 meters from 
the bank of the river. Elevation, 64.062 feet. 
The elevations on the Atlanta and St. Andrews Bay railroad 
may be determined approximately from the profile, (See map) 
which is based on levels made by Mr. Arthur Pew. Mr. Pew made 
levels also on the Marianna and Blountstown railroad from Mari- 
anna to Blountstown, and on the Birmingham, Columbus and St. 
Andrews railroad from Chipley to Southport. The elevation at the 
end of the track on the river bank at the landing at Blountstown, 
aocording to Mr. Pew is 63.86 feet lower than the base of the rail 
at the depot at Marianna. The level at Marianna according to the 
corrected levels is 115 feet. Hence the actual level at Blountstown 
landing is 51.1 feet above sea. The elevation at the base of the rail 
at the depot at Chipley according to the corrected levels is 103.31 
feet. The maximum elevation shown by the profile across this area 
is 322 feet near Round Lake. 
The elevations 011 the Louisville and Nashville railroad have 
been kindly supplied by Mr. W. H. Courtenay, Chief Engineer. 
The profile and levels on this road, as checked on the bench mark 
at the Apalachicola river appear to be about 5.7 feet above the 
actual levels as established by the U. S. Army Engineers.* This 
correction has been made in the elevations as here listed. The levels 
given are at the base of the rail opposite the mile post. 
* According to the levels supplied by Mr. Courtenay the track level on the 
bridge at the Apalachicola river is 88.5 feet. The actual level at the base 
of the rail on the drawbridge as determined from the bench mark near by is 
82.73 feet above sea. The difference, 5.7 feet, is the correction applied in these 
levels. 
