PP

* Jour. Geol., vol. IV,

Umpleby (J. B.)

1910.—"Geology and Ore Deposits of Republic Mining

District, Washington." Wash. Ste Survey, Bull, n° JD il.

1912.—‘*An Oid Erosion Surface in Îd

aho. Its Age and Value as a Datum Plane.” Jour. Geol.,

vol. XXII, PP. 139-147.

Weed (W. H.) and Pirsson (£.V) 1895.—‘‘Jgneous Rocks of Yogo Peak, Montana." Amer. Jour. Sci, (3), vol. [, pp. 467-479.

1895a.—"‘Highwood Mountains of Montana.” Geol. Soc. America, Bull., vol. VI, pp. 415.

1896.—"The Bearpaw Mountains, Montana."

Amer. Jour.

Sci. (4), vol. I, PP. 283-301, 351

-362; vol. II, PP. 136-148.

Williams (°F) 1891.—‘The Igneous Rocks of Arkansas."

Geol. Surv, Arkansas, Rapp. ann. pour

1890, pp. 1-391, 429-457,

Willis (B.) 1887.— Changes in River Course due to Glaciation.'' US. Geol. Surv., Bull. 40.

1898.—‘‘Educat nal Series of Rock Specimens"' (Diller), Ibid., Bull 150, p. 316.

sin Washington Territory

Willis (B.) et Smith (G. O.) Voyez Smith (G. O.)

Young (G, À.)

1904.—" Géologie et Pétrographie d'Yamaska Québec."

anada, rapp. annuel., vol. XVI, partie

Comm. géol. du C H, pp. 38-43.

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