week..] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1896. 69 
513 Mitchell (James A. i. The discovery of fossil tracks in the Newark 
system (Juratrias) of Frederick County. Md. 
Julius Hopkins Univ. Circ, vol. xv. pp. 15-16, 1895. 
Describes the distribution of the Juratrias in Maryland and the occur- 
rence of the fossil tracks. 
514 Moore (Charles J.) [Geology of Cripple Creek district. Colorado.] 
In discussion of paper by Whitman Cross on the sain*- subject. See 
No. 150. 
515 Morris (Charles). Life before fossils. 
Am. Nat., vol. xxx, pp. 188-194 and 279-285, 1896. 
Discusses the probable occurrence of life prior to tin- earliest known 
fossils. 
N. 
516 Nason (Frank L.). The auriferous gravels of the Upper Columbia 
River [British Columbia]. 
Eng. and Mg. Jour., vol. lxi. pp. 279-2SO. 1*96. 
Describes the auriferous gravels in this region. 
517 Winslow (Arthur i. Haworth E.), and. A report on the Iron 
Mountain sheet, including portions of Iron. St. Francois, and 
Madison counties [Missouri J. 
See Winslow (A. >, Haworth - E. (, and Nason | F. L), No. 769. 
518 Neill (-lames W.). Camp Floyd district. Utah. 
Eng. and Mg. Jour., vol. lxi, pp. 85-86, 1896. 
Describes the geologic features of the region and the occurrence of 
the gold ores. 
519 Newberry (John Strong). The ilora of the Amboy clays. A 
posthumous work edited by Arthur Hollick. 
U. S. Geol. Snrv., Mon. xxvi. 256 pp., 58 pis.. 1896. 
Includes a discussion of the botanical characters and geographical 
distribution of the llora and descriptions of species. 
520 Nicol (W.). Anhydrite in Ontario. 
Can. Pec Sci., vol. vii. p. 61. 1896. 
Describes mineralogic characters of a specimen and u'ives it< chemical 
analysis. 
521 Nitze (H. P>. C). North Carolina monazite. 
Am. Inst. Mg. Engrs., Trans., vol. xxv. pp. 40-43, 1896. 
Gives a brief description of the character and distribution of monazite. 
522 and Wilkens | H. A. J.). The present condition of gold min- 
ing in the southern Appalachian States. 
Am. Inst. Mg. Engrs., Trans., vol. xxv, pp. 661-796 and 1021 and 
1025, figs. 1-28, 1*96. 
Describes the geographic and geologic distribution of the gold belts 
and gives an account of the mining industry of the several States, and a 
description of the mining, milling, and metallurgical methods, y 
