IKON ORES. 357 



rather than as evidence of local deposits. These manifestations are appar- 

 ently connected with cross dykes in Burnetan strata wherever we have met 

 them. They are well developed in the region of the Body Mountains, near 

 Fleming, in the King Mountains, and elsewhere, and near the divide between 

 Hooking Hollow and Spring Creek, in Burnet County. 



DISTRIBUTION OF THE HEMATITES. 



As may be inferred from the foregoing statement, the geographic range of 

 the hematites is much less restricted than the magnetic ore belts; and yet 

 there is such a close relation between the two that we may almost determine 

 the locus of one from the discovery of the other, provided that certain strat- 

 igraphic conditions are fulfilled in the exposures. But the hematites are not 

 all as deeply buried as the magnetites, and they belong in large measure to 

 later periods, which in our region are represented by deposits now extending 

 over wide areas. Speaking then of the whole group of hematites, it is proper 

 to state that they are chiefly to be sought in the red sandstones of the Cam- 

 brian System, and especially at the contacts of these with the earlier terranes 

 as well as in the same situations as the magnetites. With much local modifi- 

 cation in accordance with principles already outlined, their general distribu- 

 tion outside of the magnetic belts is along the edge of the Central Mineral 

 Region, particularly upon the north, south, and west. In Mason County 

 there is an irregular fringe of the rocks in which these ores often occur else- 

 where, and it may be that important outcrops in that section may yet be dis- 

 covered. Quantities of fine segregations occur in side canyons of the James 

 River valley, and some of the collections from this country seem to indicate 

 the near presence even of the magnetites. At Caylor's lead? diggings, near 

 the divide between Honey and Little Bluff creeks, I got No. 12, Table III, 

 which is one of the best of the hematite ores of the whole region. The north- 

 west and other trends cross near this point, and it may be that diligent search 

 will develop something of great interest, although the confusion of strata is 

 too great there to hope for continuous deposits of any kind. 



TABLE in. HEMATITES. 



Localities. 



1. Iron Mountain, Llano County. 



2. Iron Mountain, Llano County. 



3. Iron Mountain, Llano County. 



4. Iron Mountain, Llano County. 



5. Near Packsaddle Mountain. Llano County. 



6. South of Packsaddle Mountain. Llano County. 



7. Pontotoc, Mason County. 



8. Pontotoc, Mason County. 



9. Brady Road, two miles east of Smoothing Iron Mountain, Llano County. 



