60 
312 James ( Joseph F.). Manual of the paleontology of the Cincinnati 
group. 
Cin. Soc. Nat. Hist., Jour., vol. xvi, pp. 178-208. 
Continues the description of fossils found in the Cincinnati group, 
from vol. xv, p. 159. 
313 The St. Peters sandstone. 
Cin. Soc. Nat. Hist., Jour., vol. xvii, pp. 115-135. 
Gives a historical sketch of the earlier description of the St. Peters 
sandstone. Describes its distribution and lithologic character and 
mentions some of the fossils found in it. 
313a Remarks on the genus Arthrophycus Hall. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xlii, p. 172 (f p.). 
313b Studies in problematic organisms: the genus Fucoides. 
Abstract: Am. Assoc. Adv. Sci., Proc, vol. xlii, p. 173 (9 1.). 
314 Jardin (Ed.). Formation du tuf calcaire ou travertin et des depots 
siliceux par la vegetation des sources d'eau chaude. 
Soc. Acad, de Brest, 2d ser., vol. xix, pp. 33-75. 
Reviews the paper by W. H. Weed on the travertine deposits of the 
Yellowstone National Park and mentions the occurrence of deposits 
by hot spring waters in Virginia, Arkansas, and California. 
315 Jenney (Walter P.). The lead and zinc deposits of the Mississippi 
Valley. 
Am. Inst. Mg. Engrs., Trans., vol. xxii, pp. 171-225 and 642-646. 
Describes the topography of the lead and zinc mining regions of the 
Mississippi Valley, the secular upheavals and depressions, their influ- 
ence on the formation of the ore deposits and the geologic occurrence 
of the ore bodies in Missouri and Wisconsin, and discusses the theo- 
ries as to their manner of formation and deposition. 
316 Jennings (E. P.). The Mesabi iron range. 
Science, vol. xxiii, p. 73. 
Describes the character and structure of the ore bodies in this region. 
317 Joggar (T. A., jr.). Some conditions of ripple marks. 
Am. Geol., vol. xiii, pp. 199-201 (correspondence). 
Reviews paper by J. E. Spurr on " False bedding in stratified drift 
deposits." 
318 Jones (Arthur J.). Coal Measures of Powsheik County [Iowa]. 
Iowa Acad. Sci., Proc, vol. i, pt. iv, pp. 59-60. 
Brief note on the occurrence of Coal Measures in this county. 
319 Cardiocarpus in Iowa. 
Iowa Acad. Sci., Proc, vol. i, pt. iv, p. 61. 
Note on the occurrence of seeds of this genus found in a seam of 
bituminous coal. 
320 Jordan (E. T. J.). Natural gas. 
Ind. Dept. Geol. and Nat. Res., 18th Rept., pp. 198-218. 
Discusses the evidences as to the loss of pressure in the gas wells of 
Indiana and the origin of natural gas. 
