iron. 629 



The Click Mountain band should be one of the best in the region as a soft 

 ore producer, provided that the process of the vein accretion has had free 

 scope, for it has drawn its supply from the Iron Mountain band of hard ore. 

 Its richness, however, in any given portion must depend upon such a variety 

 of local conditions that generalizations of value are not permissible. The 

 samples reported in Table III from this line are particularly choice, being re- 

 markable for their contents of carbonic acid, an unusual ingredient in most 

 of the Central Texas limonites, even in the limestone region. (See analyses 

 Nos. 57, 58, etc.) 



CEDAR MOUNTAIN BANDS. 



A prominent vein can be traced beyond the interior area northwestward 

 through the Silurian limestones as far as the mouth of Little Brady Creek, 

 in McCulloch County, and another parallel vein courses through the same 

 region westward, both marking the lines of well developed faults. These 

 veins also appear on Cedar Mountain, in Llano County, and in the Silurian 

 areas southeastward. They are the offspring, as it were, of the Oxford and 

 Pontotoc magnetite bands, respectively. Their characteristics are not very 

 unlike what has been stated of the other vein masses. The more eastern out- 

 crops in southwestern San Saba County have, however, some interesting fea- 

 tures, including concretionary crystallizations of the ore (turgite) and of calcite, 

 aragonite, etc. As will be seen from analysis No. 60, Table III, this locality 

 has yielded richer ore than any of the soft ore deposits yet tested from the 

 Central Mineral Region. It is well exposed in the line of the fault, near the 

 the San Saba and Fredonia road, almost at the divide on the east side of 

 Hinton Creek. I am not as confident of the direct continuity of these iron 

 ores, although they have been detected in many places along the plotted line. 

 The calcite seems to be a very constant material in the vein. 



The more western vein has very much the same character, and on this ac- 

 count calls for no special mention. 



Still another vein crosses Cedar Mountain farther south, and is recognized 

 at various points as the prolongation of the course laid down on the map as a 

 manganese band. This has already been noticed under the head of Manga- 

 nese Ores, on page 602. Although its product is sometimes more nearly like 

 our ordinary soft iron ores, it is not necessary to give it further description 

 here nor to designate it by number and name in this connection. 



THE LOST LOAFER CREEK BAND. 



Again, in a fault line marked by outcrops apparently related in a similar 

 manner to a buried hard ore band a vein runs through the border districts 

 upon both ends of the interior area. It shows east of Fredonia, on Lost Creek 



48 ~ geol. 



