LIST OF PUBLICATIONS. 



143 



GEOLOGY AND MINERALOGY. 



Laney, Francis Baker. The relation 

 of bornite and chalcocite in the cop- 

 per ores of the Virgilina district of 

 North Carolina and Virginia. 



Proc. U. 8. Nat. Mm., 40, 

 No. 1835, May 31, 1911, 

 pp. 513-524, pis. 63-69. 

 The rocks of the district are 

 greenstone and sericite schists, de- 

 rived from a pre-existing series of 

 volcano-sedimentary rocks in places 

 intruded by gabbro and granite. 

 The greenstone carries fissure veins 

 of bornite and chalcocite in a 

 gangue of quartz, epidote, and cal- 

 cite. The ore minerals were 

 studied in polished section under 

 the microscope by a method in 

 part developed by the author. The 

 bornite is shown to be of one pe- 

 riod of deposition ; the chalcocite 

 of two periods, namely, one 

 younger than and filling minute 

 fractures in the bornite, the other 

 contemporaneous and intergrown 

 with it. The bornite and greater 

 part of chalcocite are considered 

 primary. The mineralization is 

 attributed to the granitic magma. 



Merrill, George P. On the supposed 

 origin of the moldavites and like 

 sporadic glasses from various 

 sources. 



Proc. U. 8. Nat. Mus., 40, 

 No. 1833, May 31, 1911, 

 pp. 481-486, pis. 61, 62. 

 The author compares the mark- 

 ings on the outer surfaces of these 

 glasses with those found on ob- 

 sidian pebbles, and finds them 

 agreeing so closely as to throw 

 great doubt on the cosmic origin 

 claimed for them by Suess and 

 others. 



FoGUE, Joseph E. Cid mining district 



of Davidson County, North Carolina. 



North Carolina Oeol. and 



Econ. Surv., Bull. 22, 1910, 



140 pp., 22 pis., 5 figs. 



A detailed description is given of 



the geography, geology, petrology, 



Pogtje, Joseph E. — Continued. 



physiography, structure, and min- 

 ing development of a district in 

 the Piedmont Plateau of North 

 Carolina, formerly productive of 

 silver, lead, copper, and gold. The 

 type collection of rocks, including 

 slate and tuff, acid volcanic 

 breccia, rhyolite, dacite, andesite, 

 andesitic tuff, gabbro, and diabase, 

 detailed accounts of which are 

 given in the report, has been de- 

 posited in the U. S. National Mu- 

 seum by the North Carolina Geo- 

 logical Survey. 



On calamine crystals from Mex- 

 ico, rutile-mica intergrowth from 

 Canada, and pseudomorphs of inar- 

 casite after pyrrhotite from Prussia. 

 Proc. U. 8. Nat. Mus., 39, 

 No. 1801, Feb. 24, 1911, 

 pp. 571-579, pis. 63, 64. 

 Calamine crystals of large size 

 from Chibuahua, Mexico, are de- 

 scribed crystallographically, and 

 their three habits are figured in 

 orthographic and clinographic pro- 

 jection. 



A biotite phlogopite intergrowth 

 of unusual perfection from Ottawa, 

 Canada, includes a triangular net- 

 work of microscopic needles, which 

 are shown to be rutile, and to 

 which the asterism exhibited by 

 the specimen is attributed. 



Crystals of marcasite from Osna- 

 briick, Prussia, with hexagonal 

 form, are shown to be pseudo- 

 morphs after pyrrhotite. 



Mineralogische Notizen. I. Gold- 



und Bleiglanzkrystalle in Verwach- 

 sung mit einem Wurfel von Pyrit. 

 II. Sand-Baryt von Kharga, Agypten. 

 Zeitschr. fitr Krystallo- 

 graphie, Band XLIX, Heft 

 3, 1911, pp. 225-228. 

 A condensed reprint of two arti- 

 cles published in Smithsonian Misc. 

 Colls., 42, 1909, pp. 477-484, and 

 Proc. U. S. Nat. Mus., 38, 1910, 

 pp. 17-24. 



PALEONTOLOGY. 



Bassler, Ray S. The stratigraphy of 

 a deep well at Waverly, Ohio. 



Amer. Joum. 8ci., 31, Jan., 



1911, pp. 19-24. 



This article is based upon borings 



from a deep well at Waverly, 



Ohio, sent to the U. S. National 



Museum for examination and re- 



Bassler, Ray S. — Continued. 



port. The borings contained enough 

 fossils to allow the determination 

 of the underground geology with 

 a considerable degree of accuracy. 

 The article contains, in addition, 

 comparisons with the general Pale- 

 ozic section of the Ohio Valley. 



