*»»,] PALEONTOLOGY, PETROLOGY, AND MINEKALOGY, 1895. 39 
&. 
158 Geikie (James). The classification of European glacial deposits. 
Jour, of Geol., vol. iii, pp. 241-269. 
Describes the glacial phenomena of Europe and gives the author's 
classification. 
159 Gibson (A. M.). Report upon the Coosa coal field [Alabama]. 
Ala. Geol. Surv., Montgomery, Ala., 143 pp. 
Describes the topographic features of the coal field, with detailed 
description of the occurrence of coal seams. Includes a sheet of cross 
sections, showing the geologic structure and succession in the region. 
1G0 Gilbert (Grove Karl). Lake basins created by wind erosion. 
Jour, of Geol., vol. iii, pp. 47-49. 
Abstract : Sci. Am. Suppl., vol. xxxix, p. 16157. 
Discusses the evidences of the action of tho wind in forming small 
lake basins in the arid portion of tho Arkansas basin. 
1G1 Sedimentary measurement of Cretaceous time. 
Jour, of Geol., vol. iii, pp. 121-127. 
Abstract: Sci. Am. Suppl., vol. xxxix, pp. 16180-16181. 
Describes certain alternations of strata in Colorado, correlates these 
with the precession of tho equinoxes, and from this deduces an estimate 
in years of a portion of Cretaceous time. 
162 New light on isostasy. 
Jour, of Geol., vol. iii, pp. 331-334. 
Discusses the results obtained by Mr. G. K. Putnam in the measurement 
of gravity by means of the pendulum. 
1G3 A rock fissure. 
Science, new ser., vol. 2, pp. 117-119. 
Describes a rock fissure in Carboniferous limestone in Arizona, con- 
sidered to be the result of tension of tho rock. Describes the character 
of the faults in the vicinity. 
164 and Gulliver (F. P.). Tepee Buttes. 
Geol. Soc. Am., Bull., vol. vi, pp. 333-342, pi. 17. 
Describes the character of the Pierre group of Colorado, in which tho 
buttes occur, the distribution and general features of the buttes, and 
the lithologic and fauna! characters of the tepeo rock. Discusses the 
origin of tho cores and the conditions affecting their distribution, form, 
and size, and compares them with buttes of other origin. 
165 Gilpin (E.). Note on the Sydney coal field [Nova Scotia]. 
Nova Scotian Inst, of Sci., Proc. and Trans., vol. viii, pp. 435-438. 
Contains description of a subordinate coal basin within the Sydney 
coal field. 
166 Girty (George II.). Development of the corallum in Favosites 
forbesi var. occidentals. 
Am. Geol., vol. xv, pp. 131-146, pis. vii-viii. 
The material on which this paper is based was found in the Niagara 
shales of Waldron, Iud. Describes tho development of tho coralla in 
Favosites forbesi, F. spiniferus, and F. conicus, and discusses the evi- 
dences, which show to what extent the development observed in F. forbesi 
is characteristic of Favosites as a ircnus. 
