INDEX. 
247 
Page. 
Wilmington Landing, sections at and near. 51, 220 
Winslow formation, character and distribu- 
tion of 15-17 
Wittsburg, clay at 42 
clay at, analysis of 43 
Wolf Creek, clays on 42, 142 
Woodruff County, clay industry in 230 
clays of ' 44 
geology of 229-230 
sections in 230 
Wormac's clay, analysis of 87 
Page. 
Wormac's clay, quality of 77-78 
Wynne, clay near 73 
sections near 71,72 
Y. 
Yell County, clay industry in 234-235 
clays of 231-233 
geology of 230 
Z. 
Zuber, clays near 192 
o 
