weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1898. 29 
147 Chamberlin (T. C). The influence of great epochs of limestone 
formation upon the consticution of the atmosphere. 
Jour, of Geol., vol. vi, pp. 609-621, 1898. 
Discusses the relation of carbon dioxide to geologic processes, and 
the changes that are effected in the atmosphere through the building 
up of great limestone formations. 
148 A group of hypotheses bearing on climatic changes. 
Brit. Assoc. Adv. Sci. Rept., 1897, pp. 614-647, 1898; Jour, of Geol., vol. 
v, pp. 653-683, 1897. 
Discusses the indications of glaciations during geologic time, and 
the theories as to the origin and development of the earth and of the 
atmosphere. 
149 A supplementary hypothesis respecting the origin of the 
loess of the Mississippi Valley. 
Abstract, Am. Assoc. Adv. Sci., Proc. vol. xlvi, pp. 204-205, 1898. 
See Bibliography and Index for 1897, No. 120. 
150 Chester (Albert H.). On krennerite from Cripple Creek, Colorado. 
Am. Jour. Sci., 4th ser., vol. v, pp. 375-377, 1 fig., 1898. 
Describes its chemical and crystallographic character. 
151 Chittenden (A. Percival). Mountain structures of Pennsylvania. 
Am. Geog. Soc, Bull., vol. xxix, pp. 175-180, 6 figs., 1897. 
Review by W. M. Davis, Science, new ser., vol. vii, p. 203 (£ p.), 1898. 
Discusses the origin of the mountain structures. 
152 Clark (William Bullock). With the collaboration of E. M. Bagg 
and George B. Shattuck. Report upon the Upper Cretaceous 
formations [New Jersey]. 
N. J. Geol. Surv., Ann. Rept. for 1897, pp. 161-210, 1898. 
Reviews the literature on the formation, describes the topographic 
features and the character and occurrence of the subdivisions of the 
Upper Cretaceous, and discusses their correlation. 
153 [Contribution to "A symposium of the classification and 
nomenclature of geologic time divisions."] 
Jour, of Geol., vol. vi, pp. 340-342, 1898. 
154 Clarke (John M.). The geological conditions at the site of the 
proposed dam and storage reservoir of the Genesee River 
at Portage [New York]. 
N. Y. State engineer and surveyor, Ann. Rept., 1896, pp. 730-746, 1897. 
Describes the character and occurrence of the Portage group, the 
topographic features of the region, and the erosion of the Portage group. 
155 The stratigraphic and faunal relations of the Oneonta sand- 
stone and shales, the Ithaca and Portage groups in central 
New York. 
N. Y., 15th Ann. Rept. State Geologist, vol. i, pp. 11-12, 31-81, pis. 
i-vii, 9 figs., 1897; N. Y. State Mus., 49th Ann. Rept., vol. ii, pp. 31-81, 
pis. i-vii, 9 figs., 1898. 
Gives a historical sketch of these groups, a discussion of their strat- 
igraphic and faunal relations, and two geologic maps. 
