eeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1904. 81 
tiindgren (Waldemar) and Hillebrand (W. F.). 
. Minerals from the Clifton-Morenci district, Arizona. 
Am. Jour. Sci., 4th ser., vol. 18, pp. 448-460, 2 figs., 1904. 
Describes the occurrence, optical and other characters, and chemical compo- 
sition of some minerals from copper deposits in Arizona. 
lindgren (Waldemar) and Ransome (Frederick Leslie). 
. Report of progress in the geological resurvey of the Cripple Creek 
district, Colorado. 
U. S. Geol. Surv., Bull. no. 254, 36 pp., 1904. 
Describes the general geology and the occurrence and character of the gold- 
ore deposits. 
iloyd (John Uri). 
L When did the American mammoth and mastodon become extinct? 
Records of the Past, vol. 3, pp. 43-46, 1904. 
ogan (W. N.). 
L Economic products of St. Lawrence County [New York]. 
N. Y. State Mus., 56th Ann. Rept, pp. rll8-rl24, 1904. 
Describes the occurrence and production of economic products of this area. 
. Geology of Oktibbeha County [Mississippi], 
Geological and Industrial Survey of Mississippi, Report 1, Miss. Agr. & Mech. 
Coll., Bull., vol. 1, no. 2, pp. 5-49, 6 pis., 5 figs., 1904. 
Describes drainage, topography, and physiography, the character, occurrence, 
and relations of the Cretaceous, Tertiary, and Quaternary formations, and 
the economic resources of the county. 
Iioomis (F. B.). 
. Two new river reptiles from the Titanothere beds. 
Am. Jour. Sci., 4th ser., vol. 18, pp. 427-429, 11 figs., 1904. 
. On some marine fossils in the Titanothere beds. 
Abstract: Science, new ser., vol. 19, p. i$54, 1904. 
joomis (F. B.), Emerson (B. K.) and. 
On Stegomus longipes, a new reptile from the Triassic sandstones 
of the Connecticut Valley. 
See Emerson (B. K.) and Loomis (F. B. ), 1. 
ouderback (George Davis). 
Basin range structure of the Humboldt region [Nevada |. 
Geol. Soc. Am., Bull., vol. 15, pp. 289-346, 8 pis., 1904. 
Describes the character, occurrence, and general relations of sedimentary and 
igneous rocks of the Basin ranges of western Nevada, particularly those of 
the Humboldt Lake mountains, and their geologic structure, discusses the 
mode of their formation and the evidences therefor, and gives an outline of 
the geologic history of the region. 
, Gypsum deposits in Nevada. 
U. S. Geol. Surv., Bull. no. 223, pp. 112-118, 1 pi., 1 fig., 1904. 
Describes character, occurrence, economic development, and geologic relations 
of gypsum deposits in northwestern Nevada 
Bull. 271—05 6 
