442 REPORT OF NATIONAL MUSEUM, 1904. 



Under an act of the Wisconsin legislature, approved March 25, 1853, 

 Edward Daniels was appointed State geologist, but at the end of the 

 year was superseded by Dr. J. G. Percival, whose work in Connecticut 

 has been already referred to (p. 329). Daniels's tirst 

 wiiconsl^jsM 11 il,ia only annual report, bearing date of 1854, con- 

 sisted of a small octavo pamphlet of 82 pages, devoted 

 largely to a consideration of the lead tields. One geological section 

 in black and white was given, extending across the lead mines from 

 the Mississippi River opposite Dubuque to the Blue Mounds. The 

 rocks were classified, beginning with the uppermost, as (1) coralline 

 beds, (2) gray limestone, (3) blue limestone, (4) buff limestone, (5) 

 sandstone, (6) lower magnesian limestone, and (7) the sandstone of the 

 Wisconsin River. A vertical section was also given showing the suc- 

 cession and relative thickness of the rocks underlying the lead regions. 

 In this last the gray limestone was given as the prevailing "surface 

 rock of the mines, containing veins of lead, and, in its lower beds, 

 zinc and copper." 



Daniels found evidence, as he thought, to strengthen the conjecture 

 of Owen to the effect that the Lower Magnesian limestone would be 

 found to contain lead ore in workable quantities. 



Aside from the above-noted publication, Daniels was the author of 

 an article on the Iron Ores of Wisconsin, in the report of the geolog- 

 ical survey of Wisconsin for 1857 (62 pages), and a brief note regard- 

 ing the lead district of Wisconsin, which appeared in the Proceedings 

 of the Boston Society of Natural History in 1854. 



According to Hall, Daniels in 1855 tirst pointed out the unconformity 

 of the western coal measures with the older rocks, though J. W. Fos- 

 ter in 1856 published a section showing a similar unconformity, the 

 discovery of which he credited to Norwood. 



Doctor Percival, who succeeded Daniels, received his appointment in 



August, 1854, and served until the time of his death, which occurred 



on May 2, 1856. Two reports, in the form of octavo pamphlets of 



about 100 pages each, were issued as the result of his 



Percival's Geological 1 • • r^. 



Survey of Wisconsin, work. Like his previous work in Connecticut, these 

 reports are extremely prosy and made up largely of 

 very minute descriptions of the lithological nature of the various rock 

 formations of the State, their geographic distribution and relative posi- 

 tion. Fossils were mentioned only occasionally, and, otherwise than 

 his reference to them as primary and secondary rocks, there is no sug- 

 gestion as to their probable geological age, with the exception of the 

 reference in the second report to the fact that the so-called ''Mound 

 limestone' 1 had been regarded from its fossils as equivalent to the 

 Niagara limestone. The character of the ore deposits, and the posi- 

 tion, number, and character of the veins were noted with great detail, 



