36 ABORIGINAL SITES IN LOUISIANA AND IN ARKANSAS. 
Mound B. Height, 14.5 feet; diameter of base, 130 feet. 
Mound C. Height, 18 feet; diameter of base approximately the same as 
that of Mound A. 
All three mounds had about the same diameters of summit-plateau, namely, 
70 feet. 
At the side of each mound was a depression, filled with water at the time 
of our visit, whence came the material for its building. These ponds were, 
respectively, west of Mound A, north of Mound В, south of Mound C. 
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Fig. 14.—Plan of mounds.  Alphenia Plantation. 
The sides of the mounds all face the cardinal points, and an equally interest- 
ing feature is that the three mounds have been arranged to form a triangle, the 
apex of which is directed toward the north, while the base is east and west. 
Furthermore, to the southward of the base of this triangle is the remainder of a 
mound, marked D on the plan. This mound at the present time is less than 2 
