102 PROCEEDINGS OF THE ACADEMY OF [1895. 



8. Lignite 2 foot. 



9. Interbedded gray sand and chocolate and greenish 



clay, turned white in places on the surface . . 20 feet. 

 At Jones' bridge, about a mile further up the river, the same 

 greenish clays are found in a section showing : 



1. Yellowish gray sand 32 feet. 



2. Bluish-green, sandy clay containing fragments of 



lignite and breaking into ovoid blocks .... 46 " 



and still farther up the river numerous shoals are formed of the same 

 bluish-green clay. The section at this place is much obscured by 

 river deposits of a much later age. 31 Here we find : 



1. Brown river loam of sand and fine gravel ... 18 feet. 



2. Black sandy loam and clay loam mixed with 



brown sand and containing gravel and a few 



drift pebbles 2 " 



3. Pale blue clay 8 " 



4. Brown sand 1 foot. 



5. Coarse gravel containing water-worn, cretaceous 



shells 2 feet, 



6. Soft conglomeratic sandstone . 2 to 4 " 



7. Bluish-green liguitic clay, breaking into blocks 



and containing broken plant remains, extending 

 across the river and forming shoals 6 " 



Nos. 4, 5 and 6 of this section do not belong to these Yegua 

 clays but form a later deposit filling a portion of the old river 

 channel and are again seen near the mouth of the Little Brazos 

 River, at which place they are found above the pale blue clay, No. 3 

 of this section. 



No. 5 of the Hope section forms the uppermost bed of the Yegua 

 clays in this part of the State but, as will be seen by the section 

 already given, these clays do not occur in Polk County nor is there 

 any trace of them along the contact in Houston or Trinity Counties 

 where the uppermost beds are altogether gray sands and pinkish-gray 

 clays, the latter carrying broken plant remains. 



The basal portion of these clays, wherever seen, carry gypsum. In 

 the eastern portion of the area this appears to be disseminated pretty 

 generally through the whole series, although the crystals are notably 

 : " Fourth Annual Keport Geol. Survey of Texas, 1892, p. 48. 



