Review of Recent Geological Literature. 393 
and portions of West Virginia and Alabama, have been studied in con- 
siderable detail: but outside of these regions little detailed work has 
been done in the Appalachian coal basin. The Big Stone Gap coal field 
is one of great economic possibilities. There is present a very full sec- 
tion of the Carboniferous series, aggregating 7,000 feet in thickness. 
The author has recognized seven different formations, to which local 
geographic names have been given as follows, in their descending order: 
Harlan sandstone 880 feet. 
Wise formation 1,270 " 
Gladeville sandstone 100 " 
Norton formation 1,280 '" 
Lee conglomerate 1,200 to 1,000 " 
Pennington shale 900 to 1,100 " 
Newman limestone 930 " 
These are apparently differentiated on their lithologic character and 
order of superposition. The Harlan and Gladeville- sandstones and the 
Lee conglomerate serve as key rocks in the interpretation of the com- 
plex faulted structure. Four productive horizons are recognized: (1) at 
the base of the Harlan sandstone; (2) directly above tin- (iladeville 
sandstone; (3) in the Imboden and Crab Orchard basins at a lower hori- 
zon extending from the Imboden to the Cannal seam; (4) in the Guest 
river basin the productive horizon extends from the Imboden seam to 
within 200 feet of the Norton formation. 
With the vast unstudied regions intervening between this and other 
fields of known stratigraphy, it is recognized that for the present the 
Big Stone Gap section must stand almost wholly alone and only general 
correlations are now possible. The Lee conglomerate can be pretty 
closely correlated with the Pottsville series; the Pennington shale and 
the Newman limestone represent the Mississippian series; while the 
Gladeville and Mahoning sandstones are probabl}" equivalent, as may 
also be the Harlan and the Wanesburg. Accepting these correlations 
the following interesting comparisons become possible: 
W. Va. Big Stone Gap. Cahaba. 
Permo-Carboniferous 1,162 880 480 
Intermediate measures 2,098 3,650 3,240 
Conglomerate 1,400 1,500 1,765 
The report is illustrated by a geologic and topographic map. and by a 
Unique Contour map of the Upper surface of the (iladeville sandstone: 
the latter is designed as an especial aid in the location of the coal seams. 
In connection with this bulletin it is of interest to read a recent pa- 
per* by the same author in which the history of the drainage system of 
the region is admirably elaborated. 11. v. b. 
The Glaeiation of tlie Yellowstone Valley north of tin Park. By W. II. 
Wkkd. (U. s. Geol. Survey. Bulletin 104. ll pp.: 1 plates. 1893. 
Price. ."> cents.) From t he extensive system of alpine glaciers Covering 
the greater part of the Yellowstone National Park, a vallej glacier is 
found to have reached 36 miles northward down the Yellowstone river 
*Am. Jour. Sci., Ill, vol. xi.vui, pp. 21-29, i s< M- 
