BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 57 
dishing-, H. P. — Continued. 
Report of a special committee on the correlation of the pre-Cambrian rocks 
of the Adirondack Mountains, the "original Laurentian area" of Canada, and 
eastern Ontario.— See Adams and others, no. 13. 
Cushman, Joseph A. 
618. Types in the paleontological collections of the Boston Society of Natural 
History.— Boston Soc. Nat. Hist., Proc, vol. 33, no. G, pp. 249-275, May, 1907. 
Daggett, Ellsworth. 
619. The extraordinary faulting at the Berlin Mine, Nevada. — Am. Inst. 
Min. Eng., Bi-Mo. Bull., no. 14, pp. 331-344, 5 figs., March. 1907; Eng. and Min. 
Jour., vol. 83. pp, 617-621, 6 figs., March 30, 1907. 
Dale, T. Nelson. 
620. The geological history of Mount Greylock [Massachusetts]. Pitts- 
field, Massachusetts, 1906. 17 pp., 5 figs. 
621. Slate deposits and slate industry of the United States.— IT. S. Geo! 
Survey, Bull. no. 275, 154 pp., 25 pis., 15 figs., 1906. 
Describes the origin, composition, and structure of slate, the methods of quarrying, 
and the occurrence of slates in various States of the Union. 
622. Note on a new variety of Maine slate. — U. S. Geol. Survey. Bull no. 
285, pp. 449-450, 1906. 
Describes the occurrence and character. 
623. The granites of Maine. With an introduction by George Otis Smith. — 
U. S. Geol. Survey, Bull. no. 313, 202 pp., 14 pis.. 39 tigs.. 1907. 
624. Recent work on New England granites. — U. S. Geol. Survey, Bull. no. 
315, pp. 356-359, 1907. 
Dale, T. Nelson, and Eckel, Edwin C. 
625. Slate deposits of the United States.— U. S. Geol. Survey, Bull. no. 275, 
pp. 51-125, 18 pis., 12 figs., 1906. 
Describes the character and occurrence of slates in various States. 
Dall, William Healey. 
626. Biographical memoir of Charles Emerson Beecher, 1856-1904. (Read 
before the National Academy of Sciences, November 16,-1904.) Washington, 
1906.— [Nat. Acad. Sci., Biog. Mem., vol. 6], pp. 57-70, 1 pi. (port.). 
Includes a list of his publications. 
627. Note on the genus Psilocochlis Dall. — Nautilus, vol. 20, no. 11. ]>. 128, 
March, 1907. 
628. On climatic conditions at Nome, Alaska, during the Pliocene, and on a 
new species of Pecten from the Nome gold-bearing gravels. — Am. Jour. Rei., 
4th ser., vol. 23, pp. 457^58, 1 fig., June, 1907. 
629. A review of the American Volutidse. — Smithsonian Misc. Coll.. vol. I s 
(Quart. Issue, vol. 3, pt. 3), pp. 341 -373, 1907. 
630. Notes on some upper Cretaceous Volutidse, with descriptions of now 
species and a revision of the groups to which they belong. -Smithsonian .Mis.-. 
Coll., vol. 50 (Quart. Issue, vol. 4, pt. 1), pp. 1-23, 13 tigs., 1907. 
Daly, Reginald. 
631. The differentiation of a secondary magma through gravitative a.ljnsi 
ment.— Festschrift Harry Rosenbusch, B. Schweizerbartsche Verlagsbuehhand- 
lung, Stuttgart, 1906, pp. 203-233, 2 figs. 
The discussion is largely based upon a study of the Movie sill in the Purcell Mountain 
Range along the international boundary between Port Hill. Idaho, and Gateway, Montana. 
