RUSK COUNTY. 263 



No. 785. Iron sandstone, six and one-half miles west of Henderson, Larissa road. 



No. 786. Iron pebble conglomerate, two and one-half miles south of Monroe. 



No. 787. Iron pebble conglomerate, seven miles north of Henderson. 



No. 790. Buckshot pebbles and iron gravel, overlying lower orange loam, Millville. 



No. 791. Soft iron conglomerate, recemented, twelve miles west of Henderson, Cherokee 

 County. 



No. 792. Pebbles from orange sandy loam, two miles east of Mount Enterprise. 



GLASS SAND. 



While no extensive deposits of pure white sand were observed, the top soil 

 sand of the ridges could be washed in vats filled with running water, by fre- 

 quent agitation to allow the clay and other impurities to flow off and the sand 

 to deposit as sediment. It could then be used to advantage for the produc- 

 tion of bottles and other coarse glassware. 



ORANGE SAND. 



At Millville, on the northern slope of the hillside, is an exposure of typical 

 orange sand ten feet thick, underlying two and one-fourth inches of fossil- 

 iferous iron sandstone. This sand very probably was originally white sand 

 It was afterward saturated with a solution of the protoxide of iron, which, 

 uniting with a portion of the silica, became greensand, and this by oxidation 

 became orange sand. On analysis a specimen afforded Mr. J. H. Herndon 

 the following composition: Sesquioxide of iron, 3.23; alumina, 1.77; silica, 

 94.60. Another specimen from one-half mile northwest of Henderson gave 

 the same analyst the. following composition: Sesquioxide of iron, 2.58; 

 alumina, 0.72; silica, 95.65. 



The bed at Millville becomes somewhat loamy near the base, and rests upon 

 six feet of red clay, and this upon a stratum of mottled red and gray clay 

 also six feet thick, under which is a bed of orange loam five feet. The chief 

 constituents of this lower bed are: Silica, 62.00; sesquioxide of iron, 8.08; 

 and alumina, 12.12. 



STRATIGRAPHY. 



About fifteen miles west of Garrison or two miles east of Mount Enterprise 

 is the following section (Eocene? to No. 5): 



1. Red clay, with overlying scattered iron pebbles and iron gravel 10 feet. 



2. Orange yellow loam, with similar pebbles and gravel 5 feet. 



3. Mottled red and yellow clay 8 feet. 



4. Sand and clay, interstratified 8 feet. 



5. Greensand shell marl, Miocene? or recent basin deposit in creek bed. 



About fifteen miles southeast of Henderson, on the Minden and Henderson 

 road, is the following Eocene? section: 



