Geology and Mineralogy. 63 
Creek Range in Nevada. Of Subcarboniferous species, five from 
a locality below Ophir City, are identical with Mississippi Valley 
species, of the Kinderhook group, Strophomena rhomboidalis, Spi- 
rifer peculiaris, Sp. centronatus, Sp. extenuatus, and Terebratula 
” : rem n 
conditions in the coal-measure area over the Rocky Mountain 
8. Historical Sketch of Geological Explorations in Pennsyt- 
vania and other States; by J 
view of early American geological papers and explorations, con- 
stituting his chapter I, will be read with great interest. It is 
itt 
of the first geological survey of Pennsylvania, and has special 
value since some of the most important principles now adopt 
4. Second Annual Report of the Geological and Agricultural 
Survey of Texas; by S. B. BucKxey, State Geologist. 96 pp. 8vo. 
Houston, Texas, 1876.—This report makes brief mention of some 
localities of the different rock-formations of the State, and treats 
More at length of the mineral and agricultural products. It is 
Stated that in the valley of the Rio Grande, from six miles below 
Fort Quitman northward to El Paso, there are two and sometimes 
three terraces, wo upper consist of sand and gravel. The 
Stavel is often filled with large water-worn quartz pebbles, and in 
