The Maquoketa Shales. — James. 
347 
his work, and who has presented the results in a paper pub- 
lished during the past year.^^ In this paper are given the re- 
cords of 136 wells in Indiana and of 80 or more in Ohio. With 
the first of these we are especially concerned, and by their aid 
we shall be able to trace the extension of the Cincinnati group 
across the state of Indiana. Then from the reports of the Illi- 
nois Geological Survey continue the work to the typical out- 
crop of what has been called the Maquoketa formation in 
Iowa, 
The upjDcr portion of the Cincinnati series is exposed in a 
few localities in southeastern Indiana. As long ago as 1837, 
Drs. Locke and Owen noted this extension ; and it is well 
known to geologists that at Richmond and Madison, Indiana, 
the highest beds of the series are found. The dip being to the 
Avestward, and northward, they are soon carried under the sur- 
face and are overlain by rocks of Niagara and later ages. 
If we take Richmond for a starting point and draw a line 
due westward we pass less than five miles to the' northward of 
Indianapolis, and touch Illinois about thirty miles north of 
Terre Haute. Along this line or in its immediate vicinity, 
never more than ten miles to the north or south, we have 
records from ten wells. In the following table these ten well 
borings are given, with the facts necessarj^ for our deductions : 
1) 
■■a 
bo 
a 
ti 
a 
u 
»6 
a 
"'^ 
V 
5 o 
M 
o2 
a 
^ 7^ 
o 
.5 "o 
o 
Names of places with weUs. 
o Z 
^fe 
o 
°v 
o-S 
OT 
s.S 
So 
E c 
M o 
« 
«>; 
■< 
H 

feet 
feet 
feet 
Richmond 
9fi4 
964 
900 
Cambridge City 
IS 
m\ 
843 
684 
ICnightstown 
:!,s 
Sfil 
754 
665 
No. 2 
;?8 
71 
70 
7ti 
854 
6C<S 
614 
640 
600 
761 
491 
394 
399 
379 
642 
543 
541 
532) 
.532 i 
These are 
approximate. 
MeCordsville 
Brightwood 
Indianapolis 
No. 2 
Plalnfleld 
<M 
96 
6;VJ 
750 
17 
95B.T. 
450 
403 
Danville 
The data in this table, though meagre, show in a suffieient- 
"Studies in the Indiana Natural Gas Field. American Geologist, 
vol. 4, pp6-21, 1889. 
