Problems, Middle Mississippi River Region, Pleistocene Time 195 
to believe that the loess was a water-laid deposit. These strat- 
ified deposits resemble the true loess of the uplands very closely, 
differing only, at least megascopically, in the presence of strat- 
ification and in complete freedom from land shells. Similar 
“stratified loess” may be seen south of Gumbo, Franklin County, 
where Wildhorse Creek Road crosses Caulks Creek. It is also 
clearly developed along DuBoise Creek, east of Washington, 
Franklin County, Missouri. 
Layers of sand are less frequently encountered than are lay- 
ers Of silt. But a lenticular-shaped bed of sand may be seen 
in a road cut on Missouri Highway 94, east of New Haven, 
Franklin County, at an elevation of 508 feet, which is character- 
istic of this terrace. A layer of sand has been excavated for 
a sand pit on Wildhorse Creek Road, a short distance west of 
Chesterfield, Franklin County. This sand is undoubtedly a part 
of the Cuivre Terrace. 
No erratics have been observed in the Cuivre Terrace along 
the Mississippi or Missouri rivers, except in the vicinity of Oak 
Grove School in Madison County, Illinois, previously described. 
The highest elevations found on the Cuivre Terrace do not 
exceed 530 feet. It is possible that the actual all:vial deposit 
does not quite reach this elevation. The alluvium may be cover- 
ed with some loess. The lowest elevations recorded are 480 feet. 
But in all cases where the elevation is less than 510 feet there 
has been ample opportunity for widespread erosion to have re- 
moved a considerable portion of the terrace. The uneroded sur- 
faces lie at elevations between 510 and 530 feet. 
The wide distribution of the terrace above St. Louis, its 
absence below St. Louis, the uniformly fine character of the 
sediments, the finely laminated top layers found in a few local- 
ities, and the quite uniform elevation of the initial surface, all 
indicate that the Cuivre Terrace was deposited in a lake which 
filled the pret valley north of St. Louis to an elevation 
of about 530 fee 
