CARBONIFEROUS. 381 



SECTION NO. 26, STRAWN DIVISION. 



Mineral Wells. 



1. Blue clay, fossiliferous '. 80 feet. 



2. Shaly sandstone . 25 feet. 



3. Limestone ] foot 6 inches. 



4. Yellow clay 44 feet. 



5. Sandstone 6 feet. 



6. Conglomerate 4 feet. 



Total. 160 feet 6 inches. 



The fossils collected at this place have been given on another page of this 

 Report. 



SECTION NO. 27, MILLSAP DIVISION. 



At Powell's Ferry, on the Brazos River. 



1. Limestone in thin layers 4 feet. 



2. Sandstone 3 feet. 



3. Yellow limestone 1 foot 6 inches. 



4. Blue clay 20 feet. 



5. Limestone 4 feet. 



Total 31 feet 6 inches. 



In No. 5 of the above section we found Produdus semireticulatus, Martin; 

 Spirifer lineatus, Martin; Athyris subtilita, Hall; Spirifer plano-convexus, Shu- 

 mard. And in No. 1 of the above section the following fossils occur: Spir- 

 ifer lineatus, Martin; S. piano-con vexus, Shumard; Fusulina cylindrica, Fischer; 

 Zaphrentis gibsoni, White; Athyris subtilita, Hall. 



This section embraces the lowest division of the Carboniferous in the north- 

 ern part of the State. Overlying this are the Trinity sands of the Cretaceous. 



LOCAL SECTIONS, CENTRAL COAL FIELD. 



We also ran a line of levels across the Central region of the Carboniferous, 

 beginning at the head of Pecan Bayou near the western line of Callahan 

 County and running thence in a southeasterly direction to the town of San 

 Saba. I made a complete section of the formation along this line. The fol- 

 lowing local sections will give the principal features of this general section: 



SECTION NO. 28, ALBANY DIVISION. 



At the center of the north line of section No. 21, made for the Buffalo 

 Bayou, Brazos and Colorado Railway Company. 



