28 Trans. Acad. Set. of St. Louis. 



sharp that, if tlie hand be laid on it, the lower portion will 

 touch the drift and the upper part will touch loess. (See 

 Fig. 2.) The bowlders are larger than those usually 

 found in the St. Louis drift and consist for the most part 

 of sandstone, which may be traced to the Coal Measure 

 sandstone in St. Louis County. However, several pieces 

 of igneous material were taken from this section, one of 

 these being polished and striated. This localitj^ marks 

 farthest south for drift of considerable thickness in St. 

 Louis, longitude 90° 14' W., latitude 38° 34' N., approxi- 

 mately. 



While excavations were being made for a foundation 

 for the Harris Teachers College greenhouses, Carr Lane, 

 south of Park avenue, 1908, a layer of bowlder clay three 

 feet thick was encountered, lying on the St. Louis lime- 

 stone. The largest bowlder is a sandstone, well planed 

 and striated. Among the erratics taken from this sec- 

 tion are quartzite, sandstone, vein quartz, quartzite, 

 Sioux or Barraboo, probabh'' the former, basalt, green- 

 stone, granite, and several undetermined igneous peb- 

 bles. This section was originally covered with loess 

 twenty feet thick. The elevation is 520 feet. 



During the construction of the piers for the viaduct 

 on Kingshighway, south of Swan avenue, a section of 

 drift was exposed. Beginning at the base the section 

 shows the following characteristics. Lying on the red- 

 dish brown shale of the Coal Measures is a layer of blue 

 bowlder clay about ten feet thick. Overlying this is a 

 layer of pebbly yellowisli ])rown cla}^, about four feet 

 thick, in which are found granite, greenstone and Sioux 

 quartzite pebbles. A quartz geode weighing fifteen 

 pounds was removed from this layer. Overlying this 

 pebbly layer is a reddish yellow, waxy material eight 

 feet thick. Above this is the loess four feet to six feet 

 thick. This section confirms the blue glacial clay re- 

 ported by Wlieeler,- from West Pine boulevard and Tay- 



='H. A. Wheeler. Trans. Acad, of Sci. St. Louis 7 : 121-122. 1895. 



