72 R. P. Stevens on the Coal Measures of Ohio and Illinois. 
Art. X.— Contributions to the Paleontological Synchronism of the 
Coal Measures of Ohio and Illinois ; by R. P. Stevens, M.D. 
Is there a stratigraphical synchronism in the two great Amer- 
ican coal fields—the Appalachian, and that of the basin draine 
by the Mississippi river 
I propose to make a contribution of such facts and observa- 
tions as have fallen under my notice, to — in the solution of 
this interesting problem in American 
To bring the subject more sclttiodll cea riage the eye, two 
sections are given. One is of the coal strata of Ohio, as ot 
n is carried u he blue, drab and purple 
shales = red sandstone ack lie t een the lower and upper 
coal-bearing strata of the Appalachian system. The other is 
taken from the shafts, borings and bluffs at Lasalle, Ill. This 
of the Illinois coal field is selected as offering the best 
_ developed system of stratification which is to be found on its 
_ northern aspect. 
_. The bare inspection of the two sections will at once satisfy 
‘most minds that the solution of the roblem cannot be looked 
for from stratigraphical geology. Indeed, to my own mind, the 
more numerous the sections, from widely separated localities, the 
‘more doubtful the synchronism 
Section 
Onto. het Iiurno1s, ae 
Non-productive shales. Grey and drab shales, - - 28 
Red sandstone. |Argillaceous limestone appar fos- 
mbterinn),:: - 5 
ee . - ee 
- ee - 5 
100|Crinoidal red shale, i pe 
10 ji fossiliferous - 15 
Grey shale, “ -. ee @ 
Blue limestone, - . - 5 
Diack shale, 5° eee 
10 
= 
18 
ee, 
9 
. . 
