52 RIO GRANDE COAL FIELDS OF TEXAS. [bull. 164. 
greatly consolidated. Above this sandstone are 6 to 8 feet of soft 
sandstone ledges. The top is some 40 to 50 feet below the bottom of 
the section opposite Myrick's lower apiary. 
Section of bluff at the Myrich apiary. 
Ft. in. 
13. Cross-bedded and irregularly stratified sandstone or soft unconsolidated 
sands, white in color but containing streaks of both yellow and red ocher. 20 
12. Sandstone 1 
11. Blue sandy clay _. 9 
10. Thinly laminated sandy shale 1 
9. Hard, fine-grained, gray sand ledge 1 
8. Fine soft bluish sands 4| 
7. Sandy seam 4 
6. Soft sandy shale, originally blue, weathers yellow 5 
5. Fine-grained, hard blue sandstone, fossiliferous 6 
4. Blue sandy shale 1 
3. Fine-grained bluish sandstone 1 
2. Sandy shale layer 2 
1. Soft, whitish or greenish, rather fine-grained sandstone (about) 2 
Total (about) 48 
A considerable collection of fossils was made from beds Nos. 4 and 5. 
The species are characteristic of the Midwayan Eocene. 
About a half mile farther downstream an abundant and rich Mid- 
wayan Eocene fauna was found. The matrix was a yellow, somewhat 
argillaceous, and slightly glauconitic sandstone. The commonest species 
of fossils are : 
Venericardia alticostata Conrad. 
Cucull?ea saffordi Gabb. 
Turritella mortoni Conrad. 
Turritella humerosa Conrad. 
The dip of the rocks is steadily downstream 2° or 3°. 
Section of bluff on the Frio River, about 1 mile below the Lewis ranch. 
Feet. 
3. Fluvial silt of variable thickness, depending upon the amount of erosion of 
the rock floor. 
2. Soft white or grayish sandstone, oxidizing brown or yellow, in ledges or 
laminated; some of it is ripple-marked. 
1. Blue-black clay at base 60 
Seel ion of Jdll below Mexican ranch, on the Frio River below the Lewis ranch. 
Feet. 
Capping of flint gravel. 
Coarse-grained gray sandstone, exposed beneath the flint gravel \ t- 
Flaggy sandstone / 
Soft shaly sandstone, about 10 
Flaggy brown sandstone 5 
Soft sandy shales 20 
Total 40 
