weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 87 
684 Upham (Warren). SublacustriDe till. 
Am. Geol., vol. xvii, pp. 371-375, 1896. 
Describes the characters and distribution of sublacustrine till in the 
northern United States and in Canada. 
685 Beaches of Lakes Warren and Algonquin. 
Am. Geol., vol. xvii, pp. 400-402 (correspondence), 1896. 
Discusses a. paper by F. B. Taylor on "The Algonquin and Nipissing 
Beaches." 
686 Origin and age of the Laurentian lakes and of Niagara Falls. 
Am. Geol., vol. xviii, pp. 169-177, tig. 1, 1896. 
Describes the pre-Glacial condition and the Glacial lakes of the St. 
Lawrence basin, and discusses the evidences as to the outlets of Lakes 
Huron, Michigan, and Superior, and the duration of Niagara Falls and 
the post-Glacial period. 
687 View of the Ice Age as two epochs. The Glacial and Cham- 
plain. 
Abstract: Am. Assoc. Adv. Soi., Proc, vol. xliv, pp. 140-145, 1896. 
Noticed in Bibliography and Index for 1895. No. 494. 
688 Causes, stages, and time of the Ice Age. 
Pop. Sci. Mo., vol. xlix, pp. 354-368, 1896. 
Discusses glacial phenomena and presents maps of the glaciated areas 
of North America and Europe. 
689 Van Diest (E. C. and P. H.). Notes on the geology of the west- 
ern slope of the Sangre de Cristo range in Costillo County, 
Colo. 
Read before the Colorado Scientific Society, in Denver, Colo., Novem- 
ber 5, 1894, 5 pp. 
Describes the Cambrian and Silurian strata and the occurrence of gold 
and silver ores. 
690 Van Diest (P. II.). See Van Diest (E. C. and P. II.), No. 689. 
691 Van Hise (Charles Richard). Principles of North American pre- 
Cambrian geology, with an appendix of flow and fracture of 
rocks as related to structure, by Leander Miller Hoskins. 
U. S. Geol. Surv., 16th Ann. Rept., Pt. I, pp. 581-872, pis. cviii-cxvii, 
figs. 101-169; Jour, of Geol., vol. iv, pp. 195-213, 312-353, 449-453, and 
593-629, figs. 7-17; Am. Jour. Sci., 4th ser.,vol. ii, pp. 205-2J3; Stone, 
vol. xiv, pp. 26-37, 8 figs., 1896. 
Discusses the phenomena of deformation, cleavage and fissility, joints, 
faults, autoclastic rocks, metamorphism of sedimentary and igneous 
rocks, and stratigraphic features. Describes the succession and corre- 
lation of the Archean and Algonkian rocks in different parts of Noith 
America. 
692 Summary of current pre- Cambrian North American literature. 
Jour, of Geo]., vol. iv, pp. 362-372, and 744-756, 1896. 
