240 FRANK LEVERETT 



drift, perhaps 25 feet higher than the village of Yarmouth, which 

 also stands on the ridge. It will be observed that the black 

 muck penetrated in this well is at a level fully 40 feet lower 

 than in the well at Mr. Stelters. This difference in level is 

 interpreted to be due to one well having struck into a valley cut 

 into the Kansan drift, while the other well entered the Kansan 

 drift near the level of the bordering uplands. 



SECTION OF WELL AT F. SMITH'S, NEAR YARMOUTH. 



Feet. 

 Yellow till (Illinoian), ------- 36 



Sand with thin beds of blue clay and also of cemented 



gravel, - - - - - - - - - ' 73 



Black muck containing wood, - - - - 6 



Sand and gravel, probably alluvial, ... - 8 



Gray silt nearly pebbleless, apparently alluvial, - - 15 



Blue till (Kansan), ....... ^ 2 



Total depth, ------ i% 



If my interpretation of the records at Yarmouth is correct, 

 there is here not only a notable accumulation of peat and muck 

 between the Kansan and Illinoian, but also an erosion of the 

 Kansan till sheet to a depth of 40 feet prior to the deposition of 

 the Illinoian. Since these sections are based entirely upon well 

 records, they afford a less clear idea of the relation of the beds 

 than might be afforded by valley excavation. 



Exposures in neighboring districts. — One of the most satisfac- 

 tory exposures yet found is that afforded by a ravine about one 

 mile northeast of West Point, in Lee county. This was first 

 seen by the writer in 1894. The following section may be 

 obtained by descending the gully at the roadside : 



Feet. 



Surface silt (loess), ------- f> 



Black soil with ashy gray subsoil, - - - .- 5 

 Brown till containing many bowlders, among which were 



two red jaspery conglomerates (Illinoian), - - 15 



Black mucky soil with gray subsoil (Yarmouth), - 6 



Brown clay with few pebbles (Kansan), - - - - 15 



Total, ------- 47 



