80 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 149. 
G21 Skewes (Edward). The ore shoots of Cripple Creek [Colorado]. 
Am. Inst. Mg. Engrs., Trans., vol. xxvi, pp. 553-579, 1896. 
Describes tbo occurrence of the ore shoots and their structural 
features. 
622 Slosson (Edwin E.). The analysis of the Salt Creek petroleum 
[Wyoming]. 
Wyoming Univ., School of Mines, Petroleum ser., Bull. No. 1, pp. 
23-47, 1896. 
Describes the chemical character ami composition of the petroleum. 
023 Smith (Eugene A.). Supplementary notes on the most important 
varieties of the metamorphic or crystalline rocks of Alabama: 
Their composition, distribution, structure, and microscopic 
characters. 
Ala. Geol. Surv., Bull. No. 5, pp. 108-130, 1896. 
Describes the distribution and general characters of the metamorphic 
or crystalline rocks and the occurrence of gold. 
G24 The phosphates and marls of Alabama. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 811-822, 1896. 
Describes the general relations of the Cretaceous and Tertiary rocks 
of Alabama and the geographic distribution of phosphates and marls in 
these beds. 
625 jSTotes on native sulphur in Texas. 
Science, new ser., vol. iii, pp. 657-659, 1896. 
Describes the occurrence of sulphur in the Guadalupe Mountains and 
discusses the origin of the deposits. 
626 Smith (Frank Clemes). The occurrence and behavior of tellu- 
rium in gold ores, more particularly with reference to the 
Potsdam ores of the Black Hills, South Dakota. 
Am. Inst. Mg. Engrs., Trans., vol. xxvi, pp. 485-515, figs. 11, 1896. 
Gives analyses of the ores, a description of the action of tellurium as a 
mineralizing agent and of the microscopic characters of the associated 
rocks. 
627 Smith (George Otis). The volcanic series of the Fox Islands, 
Maine. 
Johns Hopkins Univ. Girc, vol. xv, pp. 12-13, 1895. 
Describes the petrographic characters of the rocks, including porphy- 
rites and spherulites. 
628 Smith (James Perrin). Marine fossils from the Coal Measures of 
Arkansas. 
Am. Phil. Soc, Proc, vol. xxxv, pp. 214-285, pis. xvi-xxiv, 1896. 
Gives lists of fossils from localities in Arkansas, describes briefly the 
lithologic characters of the Coal Measures and compares them with Coal 
Measure formations of other countries and with the Pacific Carbonifer- 
ous. Discusses the classification and correlation of the Arkansas Coal 
Measures and gives a correlation table and notes on the marine fossils. 
