CARBONIFEROUS. 377 



LOCAL SECTIONS, NORTHERN COAL FIELD. 



In order to secure an accurate knowledge of the entire Coal Measure sec- 

 tion of Texas, two lines of levels were run entirely across them and the sec- 

 tion constructed by actual observation of the formation, stratum by stratum. 

 The following local sections will show in detail the character of the formation, 

 and the plate of cuts No. XVI will give, on a reduced scale, the sections them- 

 selves. The location of the line of levels and locality of each section given 

 will be found properly designated on the map accompanying this Report.* 



The following sections were made along the line of levels that we ran across 

 the Carboniferous formation from the northeast corner of Throckmorton 

 County in a southeasterly direction to the line of Hood County: 



SECTION 17, CISCO DIVISION. 



This section was made about three-fourths of a mile east of where the Sey- 

 mour and Graham road crosses Skid Creek, about eight miles west of Bel- 

 knap. 



1. Blue Clay 4 feet. 



2. Coal and shale, Seam No. 7 2 feet. 



3. Yellow sandstone, shaly 3 feet. 



4. Blue and yellow clay 15 feet. 



5. Coal 4 inches. 



6. Blue Clay 10 feet. 



7. Carbonaceous shale 3 feet. 



8. Sandstone . 4 feet. 



Total 41 feet 4 inches. 



SECTION 18, CISCO DIVISION. 



At mouth of Whisky Creek, three miles west of Belknap. 



1. Shale 3 feet 



2. Coal v 1 foot 2 inches. 



3. Limestone _ 2 feet. 



4. Sandstone, shaly 25 feet. 



5. Coal Seam No. 7 1 foot 8 inches. 



6. Sandstone and shale 8 feet. 



7. Coal 1 foot. 



8. Conglomerate '. . 40 feet. 



9. Soil 2 feet. 



Total 83 feet 10 inches. 



* See Plate XVIII. 



