weeks.] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1895. 55 
300 Lonsdale (Elston Holmes). Cement materials in Iowa. 
Abstracts: Iowa Acad. Sci., Proc, vol. ii, pp. 172-174; Eng. and Mg. 
Jour., vol. ix, p. 153. 
Contains brief remarks on certain deposits in Iowa. 
301 Upper Carboniferous of southwestern Iowa. 
Iowa Acad. Sci., Proc, vol. ii, pp. 197-200. 
Reviews previotis descriptions of these beds and describes their 
character and thickness. 
302 Luquer (L. Mel.) and Volckening (G-. J.). On three new analyses 
of sodalite from three new localities [Ontario]. 
Am. Jour. Sci., 3d* ser., vol. xlix, pp. 465-466. 
Describes the occurrence and chemical composition of sodalite from 
Ontario, Canada, Ural Mountains, Asia, and the Congo State, Africa. 
303 Lyman (Benjamin Smith). Report on the New Red of Bucks and 
Montgomery counties [Pennsylvania]. 
Pa. Geol. Surv., Final Rept., vol. iii, part 2, pp. 2589-2638, pis. 596-611. 
Describes the occurrence, distribution, and structure of the formation 
in eastern Pennsylvania and discusses its occurrence in other portions of 
the Middle and Southern Atlantic States, and in New England. 
304 The Yardley fault [Pennsylvania]. 
Am. Phil. Soc, Proc, vol. xxxiv, pp. 361-384, pi. x. 
Refers to a previous description of the fault by Prof. H. Carvill 
Lewis. Describes the phenomena connected with the fault and dis- 
cusses the evidence as to the extent and direction of the downthrow. 
305 The Chalfont fault rock, so called. 
Am. Phil. Soc, Proc, vol. xxxiv, pp. 384-388, pis, xi-xii. 
Quotes from a previous description of the fault phenomena at Chal- 
font, Bucks County, Pa., by Trof. H. Carvill Lewis. Describes the dips 
and cleavage planes of the strata as shown in two plates. 
M. 
300 McCalley (Henry). Alabama barite or heavy spar. 
Ala. Ind. and Sci. Soc, Proc, vol. v, pp. 25-29. 
Describes its occurrence in Silurian rocks of Alabama, and the pro- 
duction in the various mines of the United States. 
307 McG-ee (W J). The extension of uniformitarianism to deformation. 
Geol. Soc. Am., Pull., vol. vi, pp. 55-70. 
Describes the movements of the earth's crust and the evidences by 
which they are detected, the methods of acquiring this knowledge, and 
the progress of knowledge of the earth's crust. Discusses the origin of 
these movements. 
308 A miniature extinct volcano. 
Abstract : Am. Assoc. Adv. Sci., Proc, vol. xliii, pp. 225-226. 
Gives a brief description of a soda lake in central Nevada and its 
lacustral history. 
309 McKellar (Peter). The silver mines of Thunder Bay [Ontario]. 
Abstract : Eng. and 'Mg. Jour., vol. lix, p. 391. 
Describes the occurrence of silver at Thunder Bay and discusses the 
origin of the deposits. 
