394 The American Geolocjist. December, is95 
mountains. Under the term Ozark uplift the author would include the 
Shawnee hills. St. Francois mountains, Ozark plateau. Boston moun- 
tains and Ouachita mountains. The uplift as a whole is a canoe-shaped 
dome extendini;- from southern Illinois to Indian Territory. It stands as 
a dividing line between the coastal plain, as represented in the Mississippi 
embayment, and the Great plains. The middle of the uplift is a typi- 
cal high plateau: around the margins are the areas of more pronounced 
topographic diversity known by the different local names given above. 
Each is considered separately. The Shawnee hills are ridges and repre- 
sent structural features. The St. Francois mountains are made up of 
isolated peaks irregularly clustered. The Boston mountains form a 
range of steep-sided elevations lying between the White and Arkansas 
rivers. The Ouachita mountains show numerous anticlinal ridges. 
They are believed to belong structurally with the remainder of the 
group, the separation being due to the more rapid erosion of the Coal 
Measure shales. 
The crystalline rocks of the region belong to two distinct periods, the 
granites and porphyries to the Archean and the eleolite syenites to the 
Cretaceous. The recognition of the Algonkian is considered as provi- 
sional only. The Ozark series is believed to include both Cambrian and 
Silurian, separated possibly by an unconformity, — that seen at Pacific. 
The i)resence of numerous vmconformities, as indicative of repeated os- 
cillations, and the freshness of the stream ei'osion, as evidenced in the 
sharpness of the valleys and the dissection of the Tertiary peneplain, 
are insisted upon as evidence of the recentness of the uplift. It is be- 
lieved, indeed, that the last cycle of elevation is not ended and that ele- 
vation is now taking place at a rapid rate. h. f. b. 
RECENT PUBL ICATIONS. 
/. Government and State Reports. 
Geol. Survey of Canada. Maps of the principal auriferous creeks in 
the Cariboo mining district, British Columbia, by Amos Bowman; maps 
364-372. 
Geol. Survey of Canada. Maps of Nova Scotia, descriV)ed in part P, 
vol. 2 (n. s.), 1886: maps 379-390, 550, 551 (sheets 25-38). 
Geol. Survey of Canada. Seine River sheet of Thunder Bay and 
Rainy River districts: geology by W. H. Smith and W. Mclnnes. 
Missouri Geol. Survey, vol. 8, Ann. Rept. for 1891, 405 pp., 30 pis., 
1895. Organization and results of a state geological survey, C. R. 
Keyes: Crystalline rocks of Missouri, Erasmus Haworth: Dictionary of 
altitudes, C. F. MarVjut: Characteristics of the Ozark mountains, C.R. 
Keyes: Coal Measures of Missouri, G. C. Broadhead. 
11th Ann. Rept. of the Inspector of Mines of Ky., for 1891, viii and 
207 pp., 1895. Rei)ort of the Inspector, C. J. Norwood: Correlation of 
Kentucky coals with those of Big Stone Gap, Va., J. M. Hodge. 
U. S. Geol. Survey. Lassen Peak folio (Cal.) of Geologic Atlas 
U. S., J. S. Diller. 
