1893.] Recent Literature. 143 
eastern escarpment of the Staked Plains, and determined the extent 
of the Dockum and Blanco Canyon Beds and their relation to the 
underlying strata. The Stratigraphy of the Triassic formation in 
northwest Texas was assigned to N. F. Drake, who embodies his obser- 
vations in a short paper of twenty-one pages. Mr. Steernwitz is still 
at work on the Trans-Pecos region. In his paper he states that rocks 
of Carboniferous age have been traced over a large area of this region, 
gives the age and relations of certain conglomerates, and the strati- 
graphic relationship between the schists and the red grit. Prof. E. D. 
Cope, who had in charge the fossil vertebrata, reports on collections 
from the Fayette formations, the Blanco Canyon bed, and the Triassic 
or Dockum beds. Dr. Sterki furnishes notes on shells found in a dry 
salt lake near Eddy, New Mexico. 
The illustrations are numerous and compare favorably with those of 
previous publications of the survey. 
Mineral Resources of the United States, 1889 and 1890.'— 
` This volume is the seventh of the series of Mineral Resources of the 
United States, and carries the statistical data to Dec. 31, 1890. An 
idea of the amount and value of the various useful mineral products 
is given in a brief summary which forms the opening chapter. The 
remaining 530 pages comprise carefully prepared statistical papers 
containing much valuable information. 
According to the report the year 1890 was a period of unexampled 
activity in mining, particularly so in iron, silver, copper, coal and 
petroleum. The total value of the product is put at $656,604,698, an 
increase far beyond any previous year. 
In addition to its individual index, this volume contains the general 
index to the entire series from 1882 to 1890 inclusive. 
“Mineral Resources of the United States, 1889 and 1890. David T. Day, 
Chief of the Division of Mining Statistics and Technology, Washington, 
1892. 
