G 
28 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
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Kans. Univ. Quart., vol. i, pp. 15-32, pis. ii-vi. 
See Williston (S. W.) and Case (E. C7), No. 649. 
54 Case (William H.). The Bertha zinc mines at Bertha, Va. 
Am. Inst. Mg. Engrs., Trans., vol. xxii, pp. 511-536. 
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cross section, and describes the character and occurrence of the ore 
and the methods of mining employed. 
55 Cazin (F. M. F.). [The genesis of ore deposits.] 
Am. Inst. Mg. Engrs., Trans., vol. xxiii, pp. 604-608. 
In discussion of paper by F. Posepny on the same subject describes 
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56 Chamberlin (Thomas C). Pseudo-cols. 
Jour, of Geol., vol. ii, pp. 205-206. 
Abstract: Am. Geol., vol. xiii, p. 217 (fp.) 
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tion of pseudo-cols. 
57 Proposed genetic classification of Pleistocene glacial forma- 
tions. 
Jour, of Geol., vol. ii, pp. 517-538. 
Describes the author's method of classifying the Pleistocene glacialM 
formations, based on the origin of the formations. 
58 Glacial studies in Greenland. 
Jour, of Geol., vol. ii, pp. 649-666 and 768-788, figs. 1-14. 
Gives an itinerary of the journey to Greenland and describes the 
characteristics of the glaciers examined. 
59 [Drift fringe on Long Island, New York.] 
Geol. Soc. Am., Bull., vol. v, p. 16 (f p.). 
In discussion of papers by A. A. Wright and E. H. Williams, jr., on 
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00 [Relation of deformation to ore deposition.] 
Geol. Soc. Am., Bull., vol. v, p. 32 (i p.). 
In discussion of paper by W. P. Blake on the Wisconsin lead and zinc 
deposits. 
01 [Formation of kames, eskers, and moraines.] 
Geol. Soc. Am., Bull., vol. v, p. 85 (J p.). 
Discusses the character of the material of which kames, eskers, and 
moraines are formed. 
62 [Classification of Pleistocene deposits.] 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 176-192 and 207 (ip.)l 
Discusses the classification of Pleistocene glacial deposits, based 
upon the origin of the formations. 
