ELISHA MITCHELL SCIENTIFIC SOCIETY. 63 



from 50 to 125 feet. From the line of the W. & W. Ry., which tra- 

 verses ihe county from N. to S. in its western part, it slopes E. and 

 AV. with a general tendency towards the east, so that most of the 

 streams empty into the North East River. 



On nearly every little stream and creek between Maxwell Swamp 

 and the North East River, 11 miles the Rock can either be seen or 

 exposed with very little trouble. Its average depth below the sur- 

 face is from 3 to 5 feet with clay, sand and soil above. At one pit 

 I found as follows : 



Feet. Inches. 



Cultivated soil and earth i o 



White sandy clay - o 6 



Light-yellowish-red clay I O 



Mottled white and red clay 4 6 



Phosphate in its sand and gravel - o 10 



7 10 



The Phosphate Rock is imbedded in a coarse, whitish sand, mixed 

 with water worn quartz pebbles, and minute garnets. 



ABSTRACT OF COJS'CLUSIONS. 



(a). The Rock is to be found in the ditches, dry "runs," and 

 branches, and long their banks at a depth of from 3 to 5 feet. 



(b). It is overlaid by clay, sand and soil. 



(c). Its upper surface is level, the lower appears to be slightly 

 inclined. 



(d). It is imbedded in a garnetiferous sand, with coarse and fine 

 water worn quartz pebbles. 



(e). The slopes of the enclosing hills vary within wide limits from 

 tV (0.10, 5f') to ^V (0.50 2fr') and below ^V 



(f). The thickness of the stratum of Phosphate Rock varies from 

 8 to 12 inches. * 



From some experiments which 1 have made in manufacturing this 

 rock into superphosphate, I am inclined to think well of it. It 

 takes kindly to sulphuric acid, and dries well. Whether it can be 

 used or not on a large scale remains to be seen. 



Laboratory Navassa Guano Company, ) 

 Wilmington, N. C. ) 



