REVIEWS 
Yearbook for toro. Illinois State Geol. Survey, Bull. No. 20, 1915. 
Pp. 165, pls. 14, figs. 8. 
Besides the administrative report and mineral production statistics, 
this bulletin contains five papers of geologic interest. These reports 
are based on work done in co-operation with the U. S. Geological — 
Survey. 
The report of F. H. Kay on the Carlinville oil and gas field and of 
E. W. Shaw on the Carlyle oil field were prepared in 1911, when those 
fields were being developed. Both are located in south central Illinois. 
The rocks are monoclinal, eastward-dipping Mississippian and Pennsyl- 
vanian strata covered by glacial drift. Minor irregularities of structure 
determine the location of the oil pools. The Carlyle oil sands are in 
the upper Chester; those at Carlinville near the base of the Coal Meas- 
ures. The production of both fields has decreased rapidly since 1912. 
The report of E. T. Savage on the geology and mineral resources of 
the Springfield quadrangle appeared, in abbreviated form, as Folio 188 
_ of the U.S. Geological Survey. 
S. W. Parr contributes a paper on the valuation of coal for gas 
manufacture. 
E. W. Shaw describes extinct Pleistocene lakes in the valleys of 
tributaries of the Ohio and Mississippi. The mouths of certain tribu- 
taries were dammed by aggradation by the master-streams. The 
deposits subsequently deposited in the ponded waters thin out upstream. 
The older of the lake beds are slightly younger than the Illinois till; 
later deposits are of Wisconsin age. 
H2 Re B: 
Mississippi, Its Geology, Geography, Soils, and Mineral Resources. 
By E. N. Lowe. Miss. State Geol. Survey, Bull. No. 12, 
LOLS -RpseeseplS-025- 
This volume is unique among recent state geological survey reports. 
The bulletin was prepared as a non-technical summary of the geology, 
geography, mineral resources, underground waters, and soils of the 
state. By the introduction of preliminary chapters treating of geologic 
processes, it becomes an elementary geologic textbook for the people of 
190 
