154 SOUTHERN BORDER OF CENTRAL COAL FIELD. 



In one place, above the highest sandstone, is a conglomerate that very 

 much resembles the "bean ore" found in the Permian in Archer County. 



In Cow Gap, a pass through the Brady mountains, the following section 

 was obtained : 



Feet. 



1. Hard limestone . . . . . . . 20 



2. Limestone 80 



3. Rotten limestone with beds of clay '. 100 



4. Pack sand (Cretaceous) , .... 10 



5. Massive limestone (Fusulina) 3 



6. Limestone 6 



7. Shaly limestone , 10 



8. Reddish clay 10 



No. 1 of this section has the same fossils as No. 2 of the Santa Anna 

 Mountain. At the base of the Cretaceous, but apparently not a part of it, is 

 a conglomerate which very much resembles the conglomerate and sandstone 

 at the head of Lynch's Creek, in Lampasas County. Cow Gap is almost di- 

 rectly south of Santa Anna Mountain, and the Brady range of mountains 

 runs east and west. The dip of the Carboniferous is to the northwest and 

 that of the Cretaceous to the southeast. 



Nine miles west, at the head of Live Oak Creek, was found an outcrop of 

 the Carboniferous limestone containing Fusulina cylindrica, Meekella striato- 

 costata, and a Terebratula. The limestone is quite shaly. 



South of Brady along the Menard road, three miles or more, there is a bed 

 of conglomerate composed of small siliceous pebbles bound together by a 

 siliceous matrix. 



This conglomerate is so compact as to take a fine polish, and the pebbles 

 being of very bright color it makes very handsome ornaments. 



Southeast, at the head of Rocky Creek, there is a pass between the hills. 

 The hills are about 30 feet high above the pass, and are Cretaceous, contain- 

 ing such fossils as Gryphcea pitcheri and Exogyra texana. Half a mile further 

 south, on Rocky Creek, the rocks of the Silurian appear, but no fossils were 

 found. 



On the north side of the river, opposite Camp San Saba, there is a bluff 

 showing a section of thin-bedded, fine-grained, purple sandstone that has 

 been extensively quarried to make chimneys. It is called in this locality 

 soapstone, but it has none of the qualities of that material. There were no 

 fossils found. Over this is a heavy-bedded, even-grained, very hard sand- 

 stone 8 feet thick. Half a mile away to the south is the upper limestone of 

 the Potsdam epoch — the glauconitic. 



Down Brady Creek, 3 miles toward the east, were found the black shales 

 above the blue limestone, as at McAnelly's Bend. In the limestone there 



