Problems, Middle Mississippi River Region, Pletstocene Time 223 
Very similar blue clay has been found in a creek just south 
of Halls Ferry and in the bed of a nameless creek half way 
between Halls Ferry and Fort Bellefontaine, both in north 
St. Louis County. 
Just across, the Missouri River from St. Charles County 
numerous boulders have been reported by various investigators. 
Fenneman?3 reported glacial gravel at the mouth of Feefee 
Creek. Shipton,?4 Bridge,?5 and Hanley,*6 found large boulders 
of quartzite and crystalline rock, which are represented by 
samples in the collections of the Department of Geology and 
Geography at Washington University. Charles Bishop, an ex- 
perienced quarryman with the Stone Ridge Quarry near Vigus, 
Misouri, told the writer several granite boulders over a foot 
in diameter were removed with the overburden of the quarry. 
The elevation of the location he pointed out is about 500 feet. 
The writer found stratified sediments in a tributary of Feefee 
Creek and a granite cobble in the vicinty of Vigus. 
On the basis of the evidence of drift in Lincoln and St. 
Charles Counties, of blue clay near St. Charles, and of a con- 
siderable accumulation of boulders and glacial gravel across the 
Missouri River from St. Charles, it would seem probable that 
the Kansan ice front crossed the Missouri River in this vicinity. 
PRE-ILLINOIAN DRIFT IN ST. LOUIS AND NORTH 
ST: LOUIS COUNTY 
In St. Louis and St. Louis County there is evidence that ice 
of definitely pre-IIlinoian age once existed. The writer has re- 
examined many localities reported by Drushell and others where 
the drift is still exposed. Many of the exposures of drift have 
been covered or obliterated by building operations. The con- 
struction, during the winter of 1935-36, of the new super- 
highway across Forest Park and eastward, exposed a practically 
continuous deposit of drift from the eastern end of Forest Park 
