240 THE IRON ORE DISTRICT OF EAST TEXAS. 



creased in thickness, while the buff crumbly was diminished in the same 

 ratio, the conglomerate remaining nearly the same. 



Quaternary. — The orange sand formation is not so noticable in this as in 

 other counties of this district, and will receive further consideration in the 

 description of the formation as seen in its best development. 



RELATION OF STRATA. 



From the foregoing sections the following general section is made, to show 

 the relation of strata to each other; it being understood that the entire section 

 is never seen complete in any one locality, and that some of the minor varia- 

 tions in alternating beds of sand and clay are omitted. 



1. Sandy soil on the summits of hills and ridges 2 feet. 



2. Conglomerate iron ore (cemented iron pebbles and iron gravel), 



Selman tract, Wesley Gooden headright 3 feet. 



3. Iron sandstone (siliceous and iron sand) cemented by ferruginous 



sedimentation. (The 2 inches in the southwest and the 3 feet 



in the northwest.) 2 inches to 3 feet. 



4. Laminated iron ore (wavy limonite), the first near Grand Bluff, the 



latter in the southwest 2 to 6 inches. 



5. Buff crumbly or bog iron ore. (Traces of the first near Grand 



Bluff, the latter in the southwest.) 2 to 3 feet. 



The two last mentioned varieties, 4 and 5, usually together in contact 

 when seen in mass, but both are sometimes wanting, and sometimes 

 replaced by fossiliferous iron sandstone. 



6. Soft to moderately hard yellow to red sandstone. (In the north- 



western portion of the county. This corresponds with the po- 

 sition of typical or upper bed of orange sand, sometimes chang- 

 ing to orange loam, and probably was originally greensand, but 

 now altered by oxidation of the protoxide to hydrated peroxide 

 of iron.) 15 feet. 



7. Geode limonite, with yellow ochre or orange loam centers, some- 



times sand centers. (This horizon is included in the orange loam 

 formation, and usually occurs near the top of the upper bed of 

 orange sand or orange loam.) 1 to 2 feet. 



8. Iron gravel, resulting from the breaking up of geode shells, crum- 



bling of the buff crumbly iron ore. mixed with iron pebbles from 

 the partial and sometimes entire disintegration of the iron con- 

 glomerate. (This has no definite vertical section, being found as 

 float on the sides of the hills and ridges, and in the valleys as 

 drift). 



9. Red iron clay. (This has resulted from the ferrugination of the 



entire bed to this depth.) 4 to 5 feet. 



10. Mottled red and gray clay. (This has resulted from partial fer- 



rugination by infiltration into joints and cracks.) 5 to 10 feet. 



1 1. Greensand. (Only two small exposures seen in northwest portion 



of this county.) 6 inches. 



