CRETACEOUS FORMATION. 83 



of this formation. Dr. Little brought together a 

 large collection of the chief varieties of these clays 

 and from these specimens, many of the analyses 

 found in the report below have been made. 



Use is al^o made of manuscript notes of my own on 

 examinations made since 1894 and of descriptions of 

 clay occurrences in the report on the Valley Eeg'ons, 

 Part I, by McOalley. 



Inasmuch as >the remiarks of Dr. Eugene W. Hil- 

 gard on the clays of Mississipppi* apply in general 

 to the clays of this State which lie immediately ad- 

 jacent to them on the east, a short extract from his 

 Report on the Geology and Agriculture of Missis- 

 sippi will not be out of place. These notes relate to 

 the clays occurring in Townships 4, 5 and 6 in Tish- 

 omingo county, Mississippi, and were published in 

 Dr. Hilgard's Report on the Geology and Agriculture 

 of Mississippi, 1860. 



"A large deposit of white clay of great purity, how- 

 ever, occurs in Tishomingo c ounty, chiefly in the 

 southern portion of the territory of the Carboni- 

 ferous formation, following very nearly its western 

 outline. It there forms a regular stratum of con- 

 siderable extent, which .in one locality at least, was 

 found to be more than 30 feet in thickness. The bed 

 attains its best development, so far as the quality 

 of the material is concerned, in the northern portion 

 of Township 5 and in Township 4, Range 11 east, 

 where it is about 30 feet underground in the uplands, 

 though at times appearing in limited outcrops on ii'he 

 banks of the streams. Northeastward and south- 

 westward from the regions mentioned, the bed also 

 occurs but changed in character, at least near the 

 surface, to a white gritty hardpan, or clays of various 

 colors and of much less purity. It forms the lowest 



