DESCRIPTIONS OF FORMATIONS 461 



light gray color. The ridge is 20 feet in height, and a well 50 feet deep 

 found only the same sand. A smaller ridge of similar sands trends east- 

 ward, crossing the line of the Houston, East & West Texas Railway north 

 of Burke, where there is another hill similar to that at Jacks Bayou and 

 composed of similar fine-grained massive or medium-bedded sands. In 

 this area a silicified tree trunk was found. It was not opalized. South 

 of this a third area of these light gray sands stretches almost to the line 

 of the Jackson contact. 



The town of Homer is underlain by a light bluish gray, cross-bedded 

 sandstone. North of the town this changes to even-bedded, medium- 

 grained sandstone, which is quarried for local use. It is overlain to the 

 south by light cream-colored clay, thin-bedded to massive, and showing 

 cross-bedding in places. Finally, there is a small hill of similar fine- 

 grained sand, hardened to quartzite, just south of Huntingdon. 



Similar remnantal bodies of fine-grained sandstones are found as de- 

 tached hills or ridges overlying the Yegua in interstream areas and north 

 of all recognized Jackson as far west as the northwest corner of Grimes 

 County. An outcrop of very similar sand was also found overlying the 

 Cooks Mountain beds of the Marine as far north as Alto, in Cherokee 

 County. 



These sands differ from any of those found in the Yegua, Jackson, or 

 Catahoula, both in material and structure. From their location it would 

 seem improbable that they can be outliers of the Catahoula, and they are 

 so different from the underlying Yegua that they can hardly belong 

 with it. 



The evidence seems clear that their stratigraphic position is between 

 the Yegua and the Jackson, and if this be true they probably represent 

 some part of the Fayette-Frio time of the Eio Grande section. 



Frio. — No evidence was foimd between the Brazos and Sabine of the 

 existence between the Yegua and Jackson of any beds representing the 

 Frio. If they were deposited in Claiborne time succeeding the Fayette, 

 they were completely eroded. 



UPPER CLAIBORNE 



Nowhere in the Texas coastal area have any beds yet been found the 

 fossils of which would suggest a reference to the Upper Claiborne, and it 

 seems probable that this period was one of elevation and erosion in this 

 region. 



JACKSON 



Eobinsons Ferry is on the Sabine liiver, about H miles south of Colum- 

 bus, Louisiana. A quarter of a mile below the ferry Deussen found an 



