1895.] NATURAL SCIENCES OF PHILADELPHIA. 115 



enclosing matrix, those in the brownish-yellow sand being often 

 free. 



As already stated these beds can be easily traced from this point 

 in a southwesterly direction for many miles, the bed containing 

 the Scutella caput- sinensis forming a particularly well marked horizon. 

 No Scutellse, however, have yet been found in Houston County or to 

 the west, although plentiful from the Neches eastward to San Augus- 

 tine. Four miles west of Alto, a range of flat-topped steep- sided 

 hills show a general section of: 



1. Gray sand 20 feet. 



2. Indurated yellow sand containing numerous Scu- 



tellae and Ostrea selhcfonnis, var. divaricata 

 Lea, Anomia ephippioides Gabb, Pseudoliva 

 vehista Con., Venerieardia planicosta Lam., and 

 Cytherea tornadonis Harris 43 20 feet. 



3. Red sand with casts of fossils 15 " 



4. Green sand with casts of fossils visible .... 4 " 

 Crossing the Niches into Houston County the section as shown in 



a well near Robbins' Ferry shows : 



1. Gray sand 6 inches to 1 foot. 



2. Laminated iron ore 4 inches to 10 inches. 



3. Indurated yellow fossiliferous sandy marl contain- 



ing Ancilla (Olivula) staminea Con., Ostrea sella> 

 fonnis, var. divaricata Lea, Anomia ephippioides 

 Gabb, Venerieardia planicosta Lam. , and Orassa- 

 tella trapaquara Harris 44 2 feet. 



4. Yellow sand 10 



5. Clay ? 1\ 



6. Fossiliferous green sandy clay containing Anomia 



ephipjiioides Gabb, Venerieardia planicosta 

 Lam., Rimella texana, var. pinna, new variety, 

 Calyptrophorus velatus Con. 15 5 to 



7. Red clay 3 to 4 



8. Blue marl with fossils same as No. 6 18 " 



9. Brown sand to bottom of well 5 " 



At the crossing of the San Pedro Creek by the Rusk road in the 



1:1 Harris, MSS., Monograph of Texas Tertiary Fossils. 



u Harris Mss. Monograph of Texas Tertiary fossils. 



45 First Annual Report Geol. Survey of Texas, 1889, p. 34. 





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