GEOLOGICAL SURVEYS IN MISSOURI. 21 7 



Missoui'i. Appendices A, B, C and D contain much statistical 

 and other matter of subordinate interest. 



The survey was discontinued after the year 1874, and most 

 of its working material was transferred to the state School of 

 Mines at RoUa, of which the president, Dr. Charles P. Williams, 

 was made acting state geologist, with a nominal appropriation. 

 Little field work seems to have been carried on under Dr. 

 Williams, and, after the year 1876, no further . support was 

 extended to the work by the state. One report was prepared 

 by Dr. Williams, which consists of a small octavo of 117 pages. 

 It contains a chapter on the " Mineralogy and General Metal- 

 lurgy of Lead," one on the "Zinc Industry of Missouri," one 

 on the "Iron Industry," and one on "Shannon County"; in the 

 appendices are given a few statistics of lead and zinc, and a 

 "Note on the Occurrence of Gold in Northwestern Missouri." 



Reviewing the results of the Second geological survey, its 

 contribution to our knowledge of the geology of the state con- 

 sisted principally : (i) of Pumpelly's observations, too soon inter- 

 rupted, upon the crystalline rocks, whose work threw much new 

 light upon their nature and relations, though the report has left 

 us in some doubt as to whether he considered the whole mass 

 of the porphyries metamorphosed elastics, or whether he meant 

 this to apply only to the Pilot Knob beds ; (2) of Broadhead's 

 detailed stratigraphic results in the Coal Measures which placed 

 on record many new and valuable sections, added much con- 

 cerning their correlation, and demonstrated the thickness of this 

 formation to be much greater than had been formerly believed ; 

 (3) of Schmidt's report on the iron ores and lead and zinc 

 deposits, especiall}^ strong in its treatment of the mineralogy, 

 but deficient in its interpretations of structure, and lacking in 

 suggestions as to origin and processes. The classification of 

 the clastic rocks remained substantially the same as tabulated 

 by Swallow and Shumard, the principal changes displayed in the 

 chart opposite page 18 of the report of 1873-74 being in the 

 subdivisions of the Lower Carboniferous; in the transference of the 

 Chouteau, Vermicular and Lithographic stages to this series ; and 



