190 The American Geologist. March, i90i. 
where a bold outlier east of the main line of hills overlooks the valley 
of the Medicine river. The line of hills crosses the Salt Fork at the 
state line and approaches the Cimarron in the northeastern part of 
Woodward county, Oklahoma. Throughout nearly its entire course 
in this county, a distance of 40 miles the Cimarron flows in a nar- 
row valley enclosed between the hills. In places the valley is little 
more than a canyon with precipitous walls 100 feet or more in hight. 
The gypsum hills trend southeast along the south side of the Cim- 
arron as far as the Glass mountains in southern Woods county, and 
then gradually retreat from this river and approach the North 
Canadian near El Reno. From this point at which the hills find 
their most eastern limit, they trend southwest across the Kiowa and 
Commanche reservation to the Red river. In Texas extensive gyp- 
sum deposits occur at Quanah, Hardman county, and in Stonewall, 
Kent and Knox counties as far as Sweetwater on the Texas Pacific 
railroad. 
Throughout this area, from Kansas to Texas, the region of gyp- 
sum deposits is from 10 to 50 miles wide and is in all places much cut 
up with canyons and streams. Certain parts of the range have received 
particular names, as for eaxmple : Glass mountains, Chautauqua moun- 
tains, Stony hills, Cedar hills and Gray Eagle and Wild Cat buttes. For 
the entire range in Oklahoma the name "Marcy" range has been pro- 
posed, but it need scarcely be feared that any other name will ever 
take the place of the good old cowboy phrase, "Gyp." hills. 
In regard to the economic importance of the gypsum it is but 
necessary to add that mills for manufacturing the product are in 
operation in all three states in which the hills are found. Of these 
perhaps the most important are located at Springvale and Medicine 
Lodge, Kansas, Okarche, Oklahoma, and Quanah, Texas. As the 
supply of material is inexhaustible it is but a matter of time when 
the gypsum from the Gypsum hills will become one of the important 
sources of income from the region. Charles Newton Gould. 
University of Oklahoma, Feb. i, 1901. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
Abbe, Cleveland, Jr. 
The Physiography of Allegany county. (Md. Geol. Sur., Alle- 
gany county, pp. 27-54, pis. 1-6, 1900.) 
Adams. F. D. 
The excursion to the Pyrenees in connection with the eighth inter- 
national geological congress. (Jour. Geol., vol. 9, pp. 28-46, 3 pis., 
Jan. -Feb., 1901.) 
