MORRIS COUNTY. 



179 



dicate the existence of a sandstone bed lying at the base of the greensand de- 

 posit found in the Rogers well on the top of the hill lying to the west. This 

 would indicate that these green sands are at least twenty feet in thickness. 



Fragments of a dark brown sandstone are scattered throughout the red 

 sands and gravels lying around the base of these hills. These sandstones 

 contain impressions of leaves. Three varieties of these leaves have been ob- 

 tained, but they have not yet been determined. 



Specimens of ores collected from this field give the following analyses: 



No. of Analysis. 



No. 1090 | 76.26 



No. 1091 i 79.07 



No. 1092 J 80.20 



No. 1093 80.20 



o 



a 



a 



< 



1 



S • 



B< 

 si 



On 



o 



a 



o 



o 



5.20 



6.84 



Trace. 



Trace. 



Trace. 



11.60 



99.90 



5.70 



5.73 



Trace. 



Trace. 



Trace. 



9.45 



99.95 



4.20 



3.10 



Trace. 



Trace. 



Trace. 



12.50 



100.00 



4.35 



5.50 



Trace. 



1.03 



Trace. 



9.00 



100.08 



53.38 



55.35 



56.14 



*56.14 



Analyses by L. E. Magnenat. 

 ^Phosphorus, 0.449. 



Locality. 

 Nos. 1090, 1091, 1092, 1093 from Henry Proctor league. 



As these ores are more or less mixed throughout the whole of this field, 

 an average analysis will best show the true worth of the ore. The following 

 is an average analysis of the above ores: 



Ferric oxide 78 . 93 



Silica : 4.86 



Alumina 5.29 



Lime. Trace. 



Phosphoric acid «. 0.26 



Sulphuric acid Trace. 



Loss on ignition 10 . 64 



99.98 



Metallic iron, 55 . 25. 



One hundred parts of iron contain 0.204 of phosphorus. 



By calcining this ore the percentage of metallic iron will be increased to 

 61.87 percent. 



The total area of ore producing lands within Morris County has been com- 

 puted at fifteen square miles. Much of this, however, may be found on care- 

 ful examination to be too poor in ore to be of any practical value. 



OREENSAND MARLS. 



Deposits of greensand marls occur at various places within the county. 



These deposits have been particularly observed on the eastern boundary of 



the county in the neighborhood of Hughes' Springs, where the deposits noted 

 19— preol, ■ 



