A 
CLAYS - Calvert formation. 
Sedimentary koalin, probably due to water assort¬ 
ment; assorted ou$ of debris; debris may have 
originated in Archaean limestone and in the 
passage of ages (possibly Ordovician & Silurian). 
That fine particles in solution can be precipit 
ated by brackish water has been proven experiment¬ 
ally. ' ! 
Aluminum silicate (Halloysite & Kaolinite). 
Bentonite- a volcanic clay around Laramie,T/yo. $ 
when volcanic ash falls in water (cataclysmic 
result) organic life is killed; possible bearing 
on barren sones above Lone 10 in Calvert formation 
