2 feet. 



12 „ 



6 „ 



3 „ 



10 „ 



1 „ 



416 W. J. McGee — Geology of the Mississippi Valley. 



7. At Aurora, Illinois. 



Yellow clay, with boulders 16 feet. 



Clean blue clay 4 ,, 



Clean sand and gravel, stratified 3 „ 



Total 23 „ 



8. Ten miles N. W. of Dubuque, Iowa. 



Surface soil 



Clean, light-yellow clay 



Sand and gravel, stratified, with small, much-worn boulders 



Loam, not distinguishable from surface 



Jointed blue clay, clean 



Sand and gravel, with water 



Total 34 „ 



9. Twelve miles 8. of Storm Lake, Iowa. 



Yellow clay, with pebbles 10 feet. 



Clean, unstratified, blue clay, very hard when dry, but 



plastic wben wet 8 ,, 



Sandy red clay, with rounded pebbles 17 „ 



Total 35 „ 



10. Near Ida, Ida county, Iowa. 



" Bluff deposit " 15 feet. 



Nearly pure yellow sand 10 ,, 



Clean blue clay, with roots and branches 5 „ 



Sandy blue clay 4 ,, 



Yellow sand, with a little clay, and a small boulder or two 14 ,, 



Coarse gravel, with boulders 4 „ 



Total 52 „ 



11. Wyoming, Jones county, Iowa. 



Coarse yellow clay, with boulders, pebbles and gravel, 



slightly stratified 20 feet. 



Blue clay, with occasional intercalated layers of fine 



gravel and sand 20 , 



Sandy yellow clay, with pebbles 1 



Total n „ 



12. Near Bed Oak, Montgomery county, Iowa. 



Black soil 



Yellow clay, gravelly and sandy 



Blue clay, with boulders and fragments of wood 



Very hard and clean yellow clay 



Yellow clay, with gravel 



Sand 



Yellow clay, with gravel 



Sand, with water 



Total 64 „ 



This section seems anomalous, but it is probable that only 

 members three, four, and five, are represented. Four and five may 

 constitute a buried kame. This well was excavated in the highest 

 hill in the neighbourhood. 



2 



feet, 



28 



>) 



4 



)! 



20 





4 



!) 



1 



J) 



4 



J) 



1 





