GEOL O GICA L SUR VE YS IN MISSO URL 2 1 9 



which are published in Vol. V. of the Transactions of the St. Louis 

 Academy of Science. 



In May, 1889, the act authorizing the present, or Third 

 geological survey, was approved. It was evidently framed 

 upon the laws of the preceding surveys, though it differed from 

 them in detail. The most noticeable differences are the absence 

 of a requirement to collect specimens in triplicate, and the 

 absence of a clause requiring county maps and reports to be 

 prepared. The state geologist is, however, directed to have 

 complete and detailed maps and reports of counties or districts 

 prepared. The appropriation for the two years, 1889 and 1890, 

 was $20,000; that for 1891 and 1892 was $40,000; out of this 

 all salaries and expenses were to be paid, including cost of pub- 

 lication. For the years 1893 and 1894, $20,000 have been appro- 

 priated, though the paper for publications is furnished in addi- 

 tion. 



The writer was elected state geologist in August, 1889, and 

 entered upon the discharge of his duties the end of September 

 following. The plan of work adopted for this survey was.: (i) 

 to prepare a series of monographic reports upon separate sub- 

 jects, which may be called Subject reports, applying to the 

 whole state ; those subjects of direct economic importance to 

 receive f^rst consideration ; (2) to prepare successively a series 

 of detailed maps of different portions of the state, and to 

 accompany these with special reports containing much descrip- 

 tive detail, which we may call Area or Sheet reports. 



The subjects of work so far undertaken have been: the 

 lead and zinc deposits ; the coals and the Coal Measures ; the 

 clays ; the iron ores ; the mineral waters ; the building stones ; 

 the crystalline rocks; the Quaternary, or, more exactly, the 

 glacial geology; the paleontology; the hypsometry ; general 

 geologic mapping. Work has advanced on all of these subjects 

 to varying extents. The study of the lead and zinc deposits 

 was begun in cooperation with the national geological survey, 

 but has been carried to completion by the state survey, and the 

 report is now nearly finished. A Preliminary Report of 226 



