LOESS-DEPOSITING WINDS IN LOUISIANA 533 
Bayou Macon Hills, with a width varying from 5 to 15 miles. ‘he 
western loess belt is seen to be somewhat longer but much narrower 
than the eastern belt. 
These belts in Louisiana show contrasts in thickness and in the 
outlines of their margins away from the Mississippi. The eastern 
belt, beginning with a thickness of from ro to 12 feet, thickens to 
Fic. 1.—Loess overlying a buried hill of red Lafayette materials. The arrows 
point to the contact. West Feliciana Parish, Louisiana. 
the northward to about 15 to 20 feet at Bayou Sara, 35 miles to the 
northward; at Vicksburg it is from 30 to 4o feet thick. The western 
belt, with about the same thickness at the south, thickens but little 
to the north, being but 12 to 15 feet thick in the Bayou Macon 
Hills, nearly 200 miles to the north. The eastern belt in Louisiana 
ends rather abruptly at the Amite River. On the west side of this 
stream the observed thickness is about 6 feet, while across the valley 
two miles to the eastward the loess is much thinner and sparsely 
developed. On the other hand, the western belt thins so gradu- 
ally that its western limits can only rarely be observed. The 
