BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 59 
Darton, Nelson Horatio — Continued. 
644. Fish remains in Ordovician rocks in Bighorn Mountains, Wyoming, 
with a resume of Ordovician geology of the Northwest. — Geol. Soc. America, 
Bull., vol. 17, pp. 541 -5GG, 7 pis., G figs., 1906. 
Describes the general geology of the Bighorn uplift and more particularly the occur- 
rence, character, relations, and faunal content of the Ordovician deposits of Wyoming, 
Montana, and Colorado. 
645. Description of the Bald Mountain and Dayton quadrangles, Wyoming. — 
U. S. Geol. Survey, Geol. Atlas of U. S., folio no. 141, 15 pp., G figs., 7 maps, 
1 columnar section sheet, 2 illustration sheets, 1906. 
Describes the physiographic features, the occurrence, character, and relations of pre 
Cambrian igneous rocks and of Cambrian, Ordovician, Carboniferous, Triassic( ?), 
Jurassic, Cretaceous. Tertiary, and Quaternary formations, the geologic structure and 
history, and the economic geology. 
646. Description of Cloud Peak and Fort McKinney quadrangles, Wyoming. — 
U. S. Geol. Survey, Geol. Atlas of U. S., folio no. 142, 16 pp., 6 figs., 7 maps. 1 
columnar section sheet, 2 illustration sheets, 1906. 
Describes the physiographic features, the occurrence, cbaracter, and relations of pro- 
Cambrian igneous rocks and of Cambrian, Ordovician. carboniferous, Triassic(?) 
Jurassic, Cretaceous, Tertiary, and Quaternary formations, the geologic structure and 
history, and the economic geology. 
647. Geology of the Bighorn Mountains. — T T . S. Geol. Survey, Prof. Paper 
no. 51, 129 pp., 47 pis., 14 figs., 1906. 
Describes the topographic features, the occurrence, cbaracter, relations, and fauna of 
pre-Cambrian, Cambrian, Ordovician, Carboniferous. Triassic. Jurassic, Cretaceous, 
Tertiary, and Quaternary formations, the glaciation, the geological structure and history. 
and the economic resources. 
648. Geology and underground waters of the Arkansas Valley in eastern 
Colorado.— U. S. Geol. Survey, Prof. Paper no. 52, 90 pp., 27 pis., 2 figs.. 1906. 
Describes the configuration and general geology, the occurrence, character, and rela- 
tions of Cambrian, Ordovician, Carboniferous, Triassic (?), Cretaceous, Tertiary, and 
Quaternary formations and of igneous rocks, the geologic history, and the underground 
waters. 
649. Mineral resources of the Bighorn Mountain region. — U. S. Geol. Survey. 
Bull. no. 2S5, pp. .303-310, 1906. 
Describes the occurrence and economic value of coal, gold, and other mineral deposits. 
650. The Great Plains of the central United States. Scottish Geog. Mag., 
vol. 32, pp. 9-18, 6 figs., 1906. 
651. Discovery of Cambrian rocks in southeastern California.— Jour. Geol 
ogy, vol. 15, no. 5, pp. 470-173, 1 fig., 1907. 
652. Coals of Carbon County, Mont. — U. S. Geol. Survey. Bull. no. 316, pp 
174-193, 1 pi., 1907. 
653. lied beds in the Laramie mountain region. —Abstract : Geol. Soc. Amer- 
ica, Bull., vol. 17, pp. 724-725, 1907. 
654. Bighorn Mountains. — Nat. Geog. Mag., vol. 18, no. <',. pp. 355 364, 8 
figs., June, 1907. 
655. Mexico, the treasure house of the world.— Nat. Geog. Mag., vol. L8, 
no. 8, pp. 493-519, 23 figs., August, 1007. 
Darton, N. II., and O'Harra, C. C. 
656. Description of the Devils Tower quadrangle [Wyoming].— U. S. Geol. 
Survey, Geol. Alias of U. S„ folio no. 150, pp., 3 maps, columnar sod ion and 
Structure seel ion sheets, 1!><>7. 
Describes the geography, the occurrence, character, and relations of Triassic, Jurassic, 
Cretaceous, and Tertiary strata, and Igneous rocks, the geologic structure and history, 
the mineral resources, and water supply. 
