198 Bulletin of Laboratories of Denison University. [Voi. xi. 
The following correlation tables are compiled from those 
given by C. A. White in his Review of the Cret. Formations 
of N. Amen, pp. 21 1-245, inclusive : 
Eocene 
Upper 
Cretaceous 
Lower 
Cretaceous 
Jurassic 
Y 
Z 
A 
B 
C 
D 
E 
F 
(t 
II 
I 
J 
K 
L 
M 
N 
O 
P 
Q 
R 
S 
T 
U 
v 
AV 
X 
Y 
Z 
A 
B 
C 
D 
E 
F 
G 
H 
I 
J 
K 
L 
M 
N 
O 
P 
Q 
R 
S 
T 
U 
V 
W 
X 
Y 
Newberry’ 
New Mex. 
Section 
King’s 
Section 
Eastern 
Colorado 
Section 
White’s 
Colorado 
Section 
North Interior 
General 
Section 
Laramie 
Group 
Denver Depos 
its and Laramie Laramie 
Formations Group 
Laramie 
Formation 
Upper 
Cretaceous 
Fox Hills 
Group 
Montana 
F"ormation 
Fox Hills 
Group 
Montana 
Formation 
Belly River 
F'ormation 
Colorado 
Group 
Colorado Colorado 
Formation Group 
Middle 
Cretaceous 
Colorado 
Formation 
Lower 
Cretaceous 
Dakota Dakota 
Group Formation 
Dakota Dakota 
Group Formatiy 
n 
Kootanic 
F’ormation 
Z 
In his earlier work in New Mexico Professor J. J. Steven- 
son followed Professor Newberry in dividing the Cretaceous into 
upper, middle and low’er divisions. In later papers (100 Merid- 
ian Surv. Vol. Ill, supplement) he united the Fort Benton, 
Niobrara and Fort Pierre groups under the name Colorado 
