54 OIL FIELDS OF TEXAS-LOUISIANA COASTAL PLAIN, [bull.212. 
Five miles west of Valda, in Polk County, a well drilled to a depth 
>f 543 feet gave the following log: 
Log of Dean well 5 miles went of \'<thl<<. Polk County, Tex. 
[Elevation, 225 feet.] 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
( iharacter of strata. 
Thickness. 
From 
Surface sands and gravels . _ 
White sand _ _ . 
Strong water sand 
Frio: 
Clay with lime . 
Blue clay 
Greenish clay with water al 195 feei 
Green shale 
Green shale with gravel 
Fayette: 
Quicksand 
Quicksand with lime and shells 
Blue clay - 
Green shale 
Shale 
Soft green shale . . 
Green clay 
Green sand with pyrites 
Quicksand 
Green sand 
Blue clay 
Green shale 
Blue clay 
Shale rich in iron pyrites . 
Dark shale . . . 
Light shale 
Shale . 
Water sand 
Grav sand 
22 
14 
59 
45 
20 
35 
35 
10 
11 
33 
s 
4 
25 
4 
25 
34 
10 
3 
21 
6 
30 
36 
11 
13 
10 
10 
:; 
Feet. 
95 
140 
160 
195 
230 
240 
251 
284 
292 
296 
321 
325 
350 
384 
400 
403 
424 
430 
460 
496 
507 
520 
530 
540 
To- 
Feet. 
22 
36 
95 
140 
160 
195 
230 
240 
251 
284 
292 
296 
321 
3.25 
350 
3S4 
400 
403 
424 
430 
460 
496 
507 
520 
530 
540 
543 
This well has been drilled through the Frio clays into and almost 
through the Fayette sands. The Frio beds here apparently have a 
thickness of 145 feet, giving the Fayette beds a thickness of 303 feet. 
