88 BIBLIOGRAPHY AND INDK* Of tf, A, GEOLOGY, [bull.1U, 
140 Foote (Warren M.). Hote on the occurrence of leadhillite pseu- 
domorphs at Granby, Mo. 
Am. Jour. Sci. ; 3d ser., vol. 1, pp. 99-100. 
Describes pseudomorphs after calcite and gdleiia. 
147 Preliminary note on a new alkali mineral. 
Am. Jour. Sci., 3d ser., vol. 1, pp. 480-481. 
Describes briefly the chemical and crystallographic characters of a 
new mineral from California, for which the term " northupite " is 
proposed. 
148 Preliminary note on a new alkali mineral. 
Phil. Acad. Nat. Sci., Proc, 1895, pp. 408-409. 
Describes the crystallographic and chemical characters of northupite, 
found at Borax Lake, California. 
149 Freeh (F.). Das Proiil ties Grossen Colorado-Canon. 
Neues Jahr. fur Min., etc., 1895, Band II, pp. 153-156. 
Gives the vertical section of the Cambrian rocks of Colorado canyon 
and a description of the geologic history of the region. 
150 Freeman (H. C). The Amnion mines, Fergus County, Montana. 
Eng. and Mg. Jour., vol. lix, pp. 416-417. 
Describes the occurrence of gold on the contact of limestone and 
porphyry in this locality. 
151 Boulder mining district, Montana. 
Eng. and Mg. Jour., vol. lx, pp. 583-584. 
Gives a historical review of mining in this district and a brief descrip- 
tion of the gold ores. 
152 Fultz (Francis M.). Erosion during the deposition of the Burling- 
ton limestones. 
Am. Geol., vol. xv, pp. 128-130 (correspondence). 
Describes deposits near Burlington, Iowa, which indicate a cessation 
of deposition and erosion, and renewal of deposition during the forma- 
tion of the Burlington limestones. 
153 How old is the Mississippi? 
Abstract: Iowa Acad. Sci., Proc, vol. ii, p. 39 (| p.). 
Gives brief notes on the geologic history of this river. 
154 Formation of the flint beds of the Burlington limestones. 
Abstract : Iowa Acad. Sci., Proc, vol. ii, p. 177. 
Brief note on the occurrence of these beds. 
155 Coincidence of present and pre-Glacial drainage system in 
extreme southeastern Iowa. 
Abstract: Iowa Acad. Sci., Proc, vol. ii, pp. 208-209 (| p.). 
Comprises brief notes on the drainage systems of the region. 
156 Extension of the Illinois lobe of the great ice sheet into Iowa. 
Iowa Acad. Sci., Proc, vol. ii, pp. 209-212. 
Discusses the general features of the ice invasion of the State. 
157 Glacial markings in southeastern Iowa. 
Iowa Acad. Sci., Proc, vol. ii, pp. 213-217, pis. xxi-xxii. 
Describes the character and directions of the markings. 
