62 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, [bull. 271: &? 
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Hayes (C. W.), Emmons (8. F.). 
1. Contributions to economic geology, 1903. 
See Emmons (S. F.), Hayes (C. W.), 1. 
Hays (Mabel). 
1. Winoka gravels, supposed Tertiary deposits. Description of 
deposits. 
Drury Coll., Bradley Field Geol. Station, Bull., vol. 1, pp. 19-21, 1904. 
Describes the character and occurrence of gravel deposits in southwestern 
Missouri. 
Heilprin (Angelo). 
1. The nature of the Pelee tower. 
Science, new ser., vol. 19, pp. 800-801, 1904. 
Discusses the mode of formation of the spine of Mont Pele. 
2. The tower of Pele*e: new studies of the great volcano of Martinique. 
Philadelphia, J. B. Lippincott & Co., L904. 62 pp., 23 pis., 4to. 
Henderson (Junius). 
1. The Arapahoe glacier in L903. 
Jour. Geol., vol. L2, pp. 30-33, I Bg., L904. 
( Jompares the status of, the A rapahoe glacier of ( Jolorado in 1903 with that of 
1902. 
2. The overturn- in the Denver basin [Colorado]. 
Colo. Univ., Studios, vol. 1, pp. 345-347, 2 figs., 1904. 
Reprinted from the Journal of Geology, vol. 11, pp. 584-586, 1903. See no. 
549 of U. S. Geol. Surv., Bull. no. 240. 
3. Paleontology of the Boulder area [Colorado]. 
Colo. Univ., Studies, vol. 2, pp. 95-107, L904. 
Gives lists, with notes on their occurrence and character, of fossils found in 
formations of Cretaceous age in the Houlder, Colorado, area. |fy[) 
Henrich (Carl). 
1. The Guanajuato mining district [Mexico]. 
Mg. Mag., vol. 10, pp. 23-30, 101-108, 15 figs., 1904. 
Describes the occurrence, geologic relations, and mining of the silver ores of 
this region. 
Herrick (Clarence Luther). 
1. A Coal-Measure forest near Socorro, New Mexico. 
Jour. Geol., vol. 12, pp. 237-251, 10 figs., 1904. it, J! 
Describes the general geologic structure of the Rio Grande Valley, and the 
occurrence, character, and fauna of Coal-Measure strata in vicinity of Socorr^ 
New Mexico. 
2. Laws of formation of New Mexico mountain ranges. 
Am. Geol., vol. 33, pp. 301-312, 393, 2 pis., 1904. 
Describes the geologic structure and physiographic features of various nioun 
tain ranges of New Mexico. 
3. The clinoplains of the Rio Grande. 
Am. Geol., vol. 33, pp. 376-381, 1 fig., 1904. 
Describes the character, occurrence, and origin of clinoplains in the vicinity of 
Socorro, JSevv Mexico. 
