378 GEOLOGY OF NORTHWESTERN TEXAS. 



SECTION NO. 19, CISCO DIVISION. 



Two hundred yards above the mouth of Whisky Creek. 



1. Bluish clay with selenite 6 feet. 



2. Coal 1 foot. 



3. Shale with limestone concretions 1 foot 6 inches. 



4. Shaly sandstone and clay 3 feet. 



5. Fine-grained sandstone 1 foot 6 inches. 



6. Sandstone, ripple marked 3 feet. 



Total 16 feet. 



In the limestone nodules in No. 3 of the above section there occur the fol- 

 lowing fossils: Productus punctatus, Martin; P. nebrascensis, Owen; Nuculana 

 bellistriata, Stevens; Spirifer cameratus, Morton; Myalina subquadrata, Shu- 

 mard; Aviculopecten occidentalism Shumard; Nuculana ventricosa, Hall; Syno- 

 cladia biserialis, Swallow. 



SECTION NO. 20, CISCO DIVISION. 



Two miles east of Belknap. 



1 . Limestone . 2 feet. • 



2. Blue clay 20 feet. 



3. Sandstone, ripple-marked and in places massive 20 feet. 



4. Yellow clay 7 feet. 



5. Shaly limestone, nodular fossiliferous 3 feet. 



6. Yellow clay 6 feet. 



7. Red clay 4 feet. 



8. Limestone 1 foot 6 inches. 



9. Blue clay with selenite 4 feet. 



10. Coal 9 inches. 



Total ^ 68 feet 3 inches. 



SECTION NO. 21, CISCO DIVISION. 



At the falls of Salt Creek, one-half mile west of Graham. 



1. Conglomerate , 4 feet. 



2. Sandstone (the Falls) 3 feet. 



3. Blue clay with calamites 50 feet. 



4. Sandstone 3 feet. 



5. Limestone, Allorisma 2 feet. 



6. Yellowish and blue clay 30 feet. 



7. Conglomerate 15 feet. 



Total 107 feet. 



In the clay of No. 6 of the above section I found the fossils given on page 

 362 of this Report as being below the limestone called Sub-Carboniferous 

 by Mr. Ashburner. 



