1892.] Geology and Paleontology. 1027 
The subject is treated with the characteristic thoroughness’ of the 
author. The geological age, mode of occurrence, composition, and 
probable origin of the phosphates are given, followed by remarks on 
the calcareous marls. The paper closes with a dissertation on the eco- 
‘nomical relations of the phosphates. Phosphatic marls have been 
found at the base and summit of the rotten limestone of the cretaceous 
formation, and in the lignitic, white limestone and Claiborne group 
of the tertiary. They are not of so high grade as those of South 
Carolina, but resemble more nearly those of New Jersey. This the 
author considers to be advantageous to the State. If they are not rich 
enough to export there is more probability of their use at home; and 
the enhancement in the value of the lands and the increase in the 
crops due to their use will represent a larger amount of capital than 
would the trade in the exported rock. 
Keyes’ Mississippian Section.—Mr. Charles Keyes substitutes 
the term Mississippian for Lower Carboniferous as applied to certain 
rocks of the Mississippi Valley, and tabulates them as follows: 
: . Chester shales. 
Kaskaskia group.......- l Kaskaskia limestone. 
i Aux Vases sandstone. 
E Ste. Genevieve limestone. 
3 St. Louis group......... ts js; Louis limestone. | : 
3l Warsaw limestone (in part ; not typical). 
E Warsaw shales and limestone. 
S| e bed. 
F Osage group........---++++ 4 Keokuk limestone. _ 
E Upper Burlington limestone. 
= Lower Burlington limestone. 
Choutea estone. 
Kinderhook group .....- | Hana shales. 
Louisiana limestone. 
Bull. G. S. A., Vol. 3, 1892. 
Geology of the Crazy Mountains.—A description recently 
published by J. E. Wolff gives some interesting features of the Crazy 
Mountains of Central Montana. They form an isolated range of the 
. Rocky Mountains rising to the height of 11,000 feet above sea level. 
_A branch of the Yellowstone River has cut a transverse valley, divid- 
-ing the range into northern and southern halves. , 
_ The range lies in a region of nearly horizontal cretaceous rocks. 
_The southern half is characterized by a basin structure, the interior of 
which is interrupted by dome-shaped uplifts of dioritic stock. The 
