202 J. Hall on Carboniferous Limestones of Mississippi Walley. 
of the strata for the subject of its action. If the action which 
elevated the t mountain chains of the west operated only on 
the palzeozoic strata, the greater amount of material in that di- 
rection would give greater elevation to the ridges, which under 
similar force would die out in the Mississippi valley for want of 
material to be elevate 
The discussion of this part of the subject however does not 
properly enter into the present paper, and will be postponed to 
asion 
A few words may express the general features of: the series of 
limestones on the south of the Ohio. All the members, 
with the exception of the higher or Kaskaskia limestone, grad- 
ion Rar out to the Ago 
‘ Siliceous ’ as it is termed in the Geological Report 
of mieae re there tes at the base of the Carboniferous lime- 
stone is rarely rates oceup pying a few feet of thickness beneath 
th ne 8 ot not recognize 
he iin The eokuk, arsaw, and St. Louis limestones 
Toy Edw 
afterwards visited and re-examined the focality indi com muni to me 
the following section, as confirmatory of the views I had th re expressed. 
The communication bears date of N ovember, 1855. 
* Celciferous sandstone; 4, St. Peter’s omer ¢, Trenton and Galena limestone 5 
we d, Coal measures resting unconformably upon the rocks below. 
See Introduction to Vol. III. aay tes of New York. 
Sate Temark in this that the ceaetee tions made and collections 
brought home by pret. Stapsbary ieee the Salt Lake region, demonstrated that 
os carboniferous_ estone, in an red or ly changes coon 
bearing numerous fossils, rests unconformably upon metamorphic rocks 
ee eee With ‘what is ¥0 well. shows fn the: Miaciaaippl 
P tone hare «ae z eat alae. Some id dire shows that pager te a ee a x 
= ection, corresponding dow = wi 
the fandamentit mais antry. 
Pet nes See 
