276 REPORT OF NATIONAL MUSEUM, 1904. 



River. The occurrence of a white marble near Hagerstown and a 

 secondary blue limestone in the vicinity of Cumberland was noted, and 

 some attention given to the coal formations in the vicinity of Cumber- 

 land and Wheeling-. He noted further the occurrence of a limestone 

 containing organic remains lying in a nearl} T horizontal position in the 

 vicinity of Chicago, but no superposition being visible, he was unable 

 to determine its relative age. 



Concerning the lead ores at Dubuque, and their apparent occur- 

 rence only in the alluvial soil, he wrote: 



From the specimens which we have seen, * * * we can not hesitate in assert- 

 ing it as our opinion that no lead has yet been discovered on the Merrimeg or Miss- 

 issippi in metalliferous limestones, but that wherever it has been found it has always 

 been in an alluvium and never in regular veins or beds, nor even in masses which 

 might be considered as coeval with the substances in which they are embedded. 



The Cambrian sandstone found between the Wassemon and the Wis- 

 consin rivers he regarded as not older than the variegated or Banter 

 sandstein of Werner (Triassic), and the Lower Silurian limestone which 

 lies above the sandstone, as corresponding to the English Lias. The 

 whole region comprising the headwaters of the Winnipeek River was 

 looked upon as having been at a comparatively recent period an 

 immense lake interspersed with innumerable barren, rocky islands, 

 which had been drained by the bursting of the barriers which tided 

 back the waters. The innumerable bowlders which he found covering 

 the valley were regarded, as were similar bowlders in other places by 

 his contemporaries, as due to the flood of waters caused by the bursting 

 of these natural dams. 



This was plainly a recognition of the extinct glacial Lake Agassiz, 

 later described by Lieut. G. K. Warren/' and the history of which was 

 worked out in detail by Warren Uphani. 



Keating's ideas as to the possible development of the mining industry 

 were not of the most advanced type. Referring to the subject of the 

 supposed source of the native copper reported by Schoolcraft (p. 244), 

 he wrote: 



The question which appears to us of far greater importance is not where the copper 

 lies, but what shall we do with it if it should be found. We are very doubtful 

 whether any other advantage would result from it, at least for a century to come, 

 than the mere addition in books of science of a new locality of this metal. 



This in 1825! The development of the Michigan copper mines 

 began about 1855, and up to 1889 the combined mines had produced 

 over 1,000,000,000 pounds of the refined metal. The output for 1889 

 alone amounted to 87,455,675 pounds. 



In a Notice of Snake Hill and Saratoga Lake and its Environs, by 

 Dr. J. H. Steel, in the American Journal of Science for this same 



a American .Journal of Science, XVI, 1878, p. 417. 



