28 PLAN OF AN ANCIENT FORTIFICATION AT MARIETTA, OHIO. 



References and Explanations. 



A. Square mound or Turret of Earth with four easy ascents to the Top. 



B. An oblong Do. with three ascents and an upright Cut on the So. East side. 



C. Another oblong square with two ascents. 



D. A Lunette, with a small Turret of Earth rising from the centre. 



E. A covert way, or communication with the low grounds at ee, where probably 



was once the bed of the River : The walls of this way are thirty feet thick, 

 and as high in many places. 



F. Appears a natural Ravine converted to an aqueduct. 



g. One of the principal entrances of the place ; about 132 feet wide. — The other 

 apertions in the lines are only half that width, except at the angles. 

 The N. W. and N. E. Walls are generally about four feet high. 

 The S. E. and S. W. something lower, and all of them 30 feet thick, with an 

 easy exterior and interior slope. 

 /. The largest of all the mounds along the lines of G. it is 15 feet high and 35 



diameter, the others only of 7 or 8 feet high, and of smaller diameters. 

 K. A mound of Earth 30 feet high and 50 feet diameter, surrounded by a redoubt 



and internal ditch of 2j feet deep. 

 L. An advanced Lunette, with an imperfect ditch. 

 M. A Wall or parapet almost effaced at this time. 



N. Excavations in the Earth from which it is supposed the walls and mounds were 

 principally composed ; that at 8 is 20 feet deep and 150 feet diameter. 



* Mounds or Turretts of Earth. d. ditches. 



Sl^l^^ Walls or parapets of Earth. 



N. B. There is at this time on the mounds and Walls of Earth timber of 4 and 5 

 feet diameter, and evidently not the first growth. 



