AMERICAN GEOLOGY DECADE OF 187(1-1879. 555 



survey in 1861, the collections and other materials, the property of 

 the survey, had been stored in the University building at Columbia, 

 which was at one time in the possession of armed troops, and the 

 materials suffered accordingly, as would naturally be expected. He 

 found, however, reports of B. F. Shumard made during the work of 

 Swallow's survey, in a fairly complete condition. These were on the 

 counties of Crawford, Clark, Cape^ Girardeau, Phelps, Ste. Genevieve, 

 Ozark, Douglas, Perry, Jefferson, Laclede, Pulaski, and Wright. 

 The reports of Swallow and Meek were also in a satisfactory condi- 

 tion. It is stated, too, that he obtained much material relating to the 

 former surveys from Shumard and Swallow, with apparently the 

 intention of editing their notes and publishing them. So far as known, 

 however, nothing was done, and on March 18 the law governing the 

 bureau was amended. Dr. J. G. Norwood, who with Dr. C. M. Litton 

 had been one of Hager's assistants, remained temporaril} T in charge of 

 the affairs of the survey from September 1, 1871, until November 

 of the same year, when K. Pumpelly was placed at the head of the 

 organization. Norwood, during his brief period of authority, was 

 assisted by G. C. Broadhead and C. M. Litton. 



Under the management of Pumpelly there were issued in Ls73 two 

 volumes of reports, the first a royal octavo of 325 pages which con- 

 tained sill of the "previously unpublished material" that had been 

 transmitted to him by earlier workers on the geological 

 of U MissouH, iSSu* 8ur W of Missouri. This comprised the reports of 

 Broadhead, Meek, and Shumard, and contained eight 

 geological maps of counties and numerous sections. 



In this same year there was published, also under the supervision of 

 Pumpelly, a preliminary report on the iron ores and coal fields, form- 

 ing a volume of 440 pages and 190 illustrations in the text, with a large 

 folio atlas of 15 sheets. Pumpelly was assisted in the preparation of 

 this work by G. C. Broadhead, W. B. Potter, Adolph Schmidt, and 

 C. 'I. Norwood as geologists; and Regis Chauvenet, chemist. Other 

 assistance was rendered by W. E. Guy. J. R. Gage, and Jackson 

 Leonard. 



In the report on the iron and coal, Pumpelly seems directly respon- 

 sible only for the ideas advanced in the first 28 pages. It is worthy 

 of note that even at this late date Pumpelly seems to have regarded 

 the porphyries of Pilot Knob and adjacent regions as sedimentary 

 rocks. He wrote: 



The porphyries are older than the Silurian and belong to the Archean (Azoic) 

 formation of which they may be the youngest member in Missouri. * * They 



are stratified on an immense scale, but owing to the rarity of interstratified beds of 

 other rocks the unraveling of the internal structure of the district is a difficult 

 problem. 



