BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 203 
Willis, Bailey — Continued. 
2596. Current theories of slaty cleavage. — Abstract: Science, new ser., vol. 
25, p. 968, June 21, 1907. 
2597. Thrusts and recumbent folds, a suggestion bearing on Alpine struc- 
ture.— Science, new ser., vol. 25, pp. 1010-1011, 1 tig., June 28, 1907. 
2598. A theory of continental structure applied to North America. — Geol. 
Soc. America, Bull., vol. 18, pp. 389-112, October, 1907. 
Williston, Samuel W. 
2599. American amphicoelian crocodiles. — Jour. Geology, vol. 14, no. 1, pp. 
1-17, 12 figs., 1906. 
Reviews the literature relating to American amphicoelian crocodiles, discusses their 
characters and relationships, and describes Cwlosuchus reedii new genus and species. 
2600. North American plesiosaurs: Elasmosaurus, Cimoliasaurus, and Poly- 
cotylus— Am. Jour. Sci., 4th ser., vol. 21, pp. 221-236, 4 pis., 5 figs., March, 1906. 
Discusses characters and relationships and gives descriptions of various species. 
2601. The skull of Brachauchenius, with observations on the relationships of 
the Plesiosaurs. — U. S. Nat. Mus., Proc, vol. 32, pp. 477^89, 4 pis., June 15, 
1907. 
Willmott, A. B. 
2602. Michipicoten Island [Ontario]. — Canadian Min. Jour., vol. 28, no. 15 
(new ser., vol. 1, no. 13), pp. 398^00, 1 fig., September 15, 1907. 
Includes notes on the geology and occurrence of the ores. 
2603. The origin of deposits of pyrites. — Canadian Min. Jour., vol. 28, no. 18 
(new ser., vol. 1, no. 16), pp. 500-503, November 1, 1907. 
Wilson, Alfred W. G. 
2604. James Bay exploration, 1905. Report of the geologist. — Temiskaming 
and Northern Ontario Railway Commission, 4th Ann. Rept., pp. 57-65, Toronto, 
1906. 
Gives notes on the economic geology and physical features of the region examined. 
2605. On the glaciation of Orford and Sutton mountains, Quebec. — Am. Jour. 
Sci., 4th ser., vol. 21, pp. 196-205, 5 figs., March, 1906. 
Describes the physiography and evidences of glaciation. 
Wilson, E. B. 
2606. Cape Nome placers.— Eng. and Min. Jour., vol. 82, pp. 680-681, 2 figs., 
October 13, 1906. 
Includes notes on the rocks of the region and the origin of the placers. 
Wilson, Guy West. 
2607. A travertine deposit in Tippecanoe County, Indiana. — Indiana Acad. 
Sci., Proc, 1905, pp. 183-184, 1906. 
Wilson, J. Howard. 
2608. Notes on the glacial geology of Nantucket and Cape Cod. — Abstract: 
Science, new ser., vol. 23, p. 389, March 9, 1906. 
2609. Deposit of Venus shells in New York City. — Science, new ser., vol. 23, 
pp. X21-S22, May 25, 1906. 
2610. The glacial history of Nantucket and ('ape Cod. With an argument 
for a fourth center of glacial dispersion in North America. New York, 1906, 
90 pp., 38 pis.. 13 figs. 
Describes the preglacial and glacial formations of Nantucket Island and presents 
the evidence in favor of a Newfoundland center of ice dispersion in explanation of the 
glacial phenomena described. 
