70 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 146 
434 Shaler (Nathaniel Southgate). Evidences as to the change of sea 
level. 
Geol. Soc. Am., Bull., vol. vi, pp. 1 11-166. 
Gives a synopsis of the author's previous views of the conditions and 
forces affecting sea level. Describes the agencies deforming shore lines, 
and discusses the value of criteria indicating higher and lower sea- 
shores. Describes the changes in altitudes of portions of North Ameri- 
can coasts and also those of other countries. 
435 Sherzer (W. H.). Native sulphur in Michigan. 
Am. Jour. Sci., 3d ser., vol. 1, pp. 246-248. 
Describes the occurrence of native sulphur in the Upper Helderberg 
limestone of Monroe County, Mich. 
430 Skewes (Edward). Cripiue Creek, Colorado. 
Eng. and Mg. Jour., vol. lix, pp. 103-104 and 151-152. 
Describes the occurrence of gold in some of the mines of Cripple 
Creek, Colo. 
437 Cripple Creek phonolite dikes, Raven Hill, Colorado. 
Eng. and Mg. Jour., vol. lix, p. 583. 
Describes the occurrence and character of the dike rock in some of 
the mines of Cripple Creek. 
438 Smith (A. D. W.), Lesley (J. P.), B'Invilliers (E. Y.) and. [Car- 
boniferous formation, Pennsylvania.] 
Pa. Geol. Surv., Final Rept., vol. iii, part i, pp. 1629-2152, pis. 205-395. 
See Lesley (J. P.), D'Invilliers (E. V.) and Smith (A. D. W.), No. 292. 
439 Smith (Eugene A.). Alabama's resources for the manufacture of 
Portland cement. 
Ala. Ind. and Sci. Soc., Proc, vol. v, pp. 44-51. 
Describes the occurrence of the raw materials in the Cretaceoiis and 
Tertiary limestones and clays of Alabama. 
440 Smith (James Perrin). Mesozoic changes in the faunal geography 
of California. 
Jour, of Geol., vol. iii, pp. 369-384. 
Describes briefly the relations of the pre- Carboniferous and Car- 
boniferous faunas and the post-Paleozoic revolution. Discusses the 
relations of the Triassic, Jurassic, and Cretaceous faunas of California, 
compares them with the Mesozoic faunas of Europe and other portions of 
western United States, and gives the author's summary of conclusions. 
441 Studies for students. Geologic study of migration of marine 
invertebrates. 
Jour, of Geol., vol. iii, pp. 481-495. 
Reviews recent literature discussing the geographic distribution of 
faunas in recent and geologic time. Discusses the causes of migration, 
the influence of land and water barriers and climatic zones in limiting 
migration, and the criteria by which the occurrence of migration is 
established. 
442 The Carboniferous strata of Shasta County, California. 
Abstract : Am. Assoc. Adv. Sci., Proc, vol. xliii, p. 247 (£ p.). 
