44 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
29G Gilbert (J. Z.). On the skull of Vertebratus ( *) undata Cope. 
Kan. Univ. Quart., vol. vii, pp. 143-148, 4 figs., 1898. 
Describes material from the Loup Fork beds of Kansas. 
297 Gilpin (E.).' Ores of Nova Scotia. Gold, lead, and copper. 
Kept, to Comm. of Public Works and Mines, 46 pp. and map, Halifax, 
Nova Scotia, 1898. 
Describes the occurrence and distribution of gold, lead, and copper 
deposits in Nova Scotia. 
298 The geological horizons of some Nova Scotia minerals. 
Brit. Assoc. Adv. Sci., Kept. 1897, p. 663 (£ p. ), 1898. 
Mentions the geologic horizons at which certain minerals occur. 
299 Girty (George H.). Description of a fauna found in the Devonian 
black shale of eastern Kentucky. 
Am. Jour. Sci., 4th ser., vol. vi, pp. 384-394, 1 pi., 1898. 
Discusses the correlation of the black shale with the Genesee shale 
of New York. Describes a new subgenus and two new species. 
300 A revision of the sponges and coelenterates of the Lower 
Helderberg group of New York. 
N. Y., 14th Ann. Rept. State Geologist, pp. 261-309, 7 pis., 1897; N. Y. 
State Mus., 48th Ann. Rept., vol. ii, pp. 261-309, 7 pis., 1897. Review by 
Stuart Weller, Jour, of Geol., vol. vi, pp. 206-207 (4 1.), 1898. 
301 Spencer (A. C.) and. The Devonian in southwestern Colorado. 
See Spencer (A. C.) and Girty (G. H.), No. 725. 
302 Goldsmith (E.). Volcanic rocks of Mesozoic age in Pennsylvania. 
Phil. Acad. Nat. Sci., Proc. 1898, pp. 90-97, pis. ii-v, 1 fig., 1898. 
Describes occurrence and characters of trap rocks near Pottstown, Pa. 
303 Goode (Richard U.). Bitterroot Forest Eeserve [Idaho- Montana]. 
Nat. Geog. Mag., vol. ix, pp. 387-400, 4 figs, and map, 1898. 
Describes the general physiographic features of the region. 
304 Goodrich (Harold Beach). Eecent warpings as shown by drain- 
age peculiarities [Alaska]. 
U. S. Geol. Surv., 18th Ann. Rept., Pt. Ill, pp. 276-289, 1898. 
Describes the Alaskan drainage and the warpings of the region, as 
measured by the streams, and gives a summary of conclusions. 
305 See Spurr (J. E.), No. 739. 
306 Goodwin (W. L.) and Miller (W. G.). Note on a mineral of the 
Oolumbite group. 
Federated Can. Mg. Inst., Jour., vol. iii, pp. 151-152, 1898. 
Describes the occurrence of the mineral in Ontario and gives a chem- 
ical analysis. 
