APPENDIX. 



The following table shows the extent of the Trinity clay in the areas surveyed 

 to this time. 



In the first column is stated the particular survey in which the soil was en- 

 countered ; in the second column, its extent in acres ; and in the third column, 

 the volume of the Field Operations of the Bureau of Soils in which the report 

 upon the area may be found. Those desiring a detailed description of the soil 

 and of the general conditions which surround it in any particular area may con- 

 sult these volumes in almost any public library. 



Areas of Trinity clay encountered in the soil survey. 



Survey. 



Area of soil. 



Year of 

 publication. 



Field 

 Operations. 



Alabama: Acres. 



Hale County 27, 456 



Montgomery County 50, 624 



Mississippi: 



Clay County 20. 032 



Monroe County 27, 904 



Oktibbeha County ' 7, 616 



Texas: 



Anderson County ' 47, 872 



Austin area 9, 984 



Bastrop County 2 2, 432 



Brazona area 133, 056 



Cooper area * 61, 248 



Corpus Christi area * 1, 024 



Franklin County * 6, 336 



Grayson County 34. 176 



Houston County 48, 768 



Morris County 6, 528 



Robertson County 14, 528 



San Marcos area * 9,920 



Titus County 12, 032 



AVaco area 5 20, 738 



Wilson County 28, 160 



1909 

 1908 

 1907 



1904 

 1904 

 1907 

 1902 

 1907 

 1908 

 1908 

 1909 

 1905 

 1900 

 1907 

 1906 

 1909 

 190:> 

 1907 



1 Mapped as Yazoo clay. 

 1 Mapped as Wabash clay. 

 3 Mapped as Sharkey clay 



14 



Mapped as Corpus Christi clay. 



Mapped as Yazoo clay and Yazoo heavy clay. 



o 



