146 THE IRON ORE DISTRICT OF EAST TEXAS. 



same class, broken bricks, ground quartz, calcined flints, sand and gravel, 

 and sometimes small coke or graphite are used. 



Many of the clays found in Harrison County will be found to be suitable, 

 when properly prepared, for the manufacture of a medium grade of fire 

 bricks or other articles intended for positions where a fair resistance to heat 

 is necessary. Some of these clays contain mechanical impurities, which by 

 the proper course of treatment can be easily eliminated. Many of the sili- 

 ceous white or gray sandy clays found in the county belong to the fire clays, 

 and some of the darker colored blue and lighter shaded clays found under- 

 neath the lignite beds may also be used for fire purposes. 



The light grayish yellow and almost white siliceous clay found overlying a 

 bed of lignite on the north side of the Francis Wilson headright will be found 

 suitable for fire purposes, but will not be found suitable for pottery purposes, 

 as the clayey proportion is not in sufficient quantities. This clay lies under a 

 heavy deposit of brown sand. The following is a section of the pit: 



1. Brown sand 6 ieet. 



2. Sandy clay 4 feet.+ 



On the south side of the same headright, in a cutting on R. Huffman's 

 farm, there is a deposit of light blue and black clays underlying a two foot 

 bed of lignite. The upper clay, or that lying immediately under the lignite, 

 may be utilized for fire clay purposes, and will also be found serviceable for 

 pottery work. This clay, however, lies at too great a depth to be of any 

 practical value for any length of time. At present it could only be e3onom- 

 ically obtained by taking it from the bed of the stream. The following is a 

 section of this opening: 



1. Brown sand and gravelly ore, gravel about four inches 45 feet. 



2. Brown sand 5 feet. 



3. White sand, somewhat stained brown throughout the upper division, but a 



pure milky white from near the centre to bottom. 26 feet. 



4. Lignite . . •. . 2 feet. 



5. Grayish blue or black clay, becoming lighter in color and iron-stained in the 



upper two feet next to the lignite . 6 feet. 



6. Blue clayey sand in strata of one inch, cross-bedded and dipping 60° north- 



east 9 feet. 



7. Light blue clay with lignitic partings 1 feet. 



8. Black clay in thin laminae . 3 feet. 



9. Yellow sand 5 feet.-f- 



108 feet. 



The light blue clay with lignitic partings may possibly be used for earth- 

 enware manufacture. 



Where the Marshall and Longview road passes through the upper part of the 

 Jose Sanchez headright there is an exposure of a light colored, almost white, 



