246 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



ceedingly rich in silver. Of these, the "Bartlett" is spoken 

 of as the most prominent, having an outcrop of vein-rock 

 (limestone) something near to 100 feet in thickness. This 

 vein is described as yielding an abundance of ore, carrying 

 from 200 to 1100 ozs. of silver per ton, and 30 per cent, of 

 copper. Several such gray copper veins are known, and lie 

 in contact with porphyry. A third class of veins lies be- 

 tween the galena veins on the north and the porphyry on 

 the south. They carry both galena and gray copper, but 

 have not thus far been sufficiently investigated to enable an 

 opinion to be formed as to their value. 



LAKE AEEA OF THE EOCENE AGE IX NEW MEXICO. 



One of the most important results of the geological sur- 

 vey of New Mexico, conducted by Lieutenant G. M. Wheeler, 

 United States Engineers, during the season of 1874, is the 

 discovery by Professor Cope of an extensive lake deposit 

 of the eocene age in the western and northern parts of that 

 territory. The deposits cover at least three thousand square 

 miles, and are three thousand feet in thickness, being worn 

 into remarkable bad-land deserts in some localities. This is 

 only the second lake area of this age discovered in the West, 

 the survey under Clarence King having discovered the long- 

 est known, viz., that of Wyoming, some years ago. Profess- 

 or Cope discovered the remains of about one hundred spe- 

 cies of vertebrata, mostly mammals, in the New Mexican 

 formations, many of them of peculiar character, and to a 

 great extent different from those of the Wyoming eocene. 

 Carnivora of an antiquated pattern were abundant, and 

 hoofed animals related to the tapir. Eight species of an al- 

 most unknown order the Toxodontia, which is related to 

 rodents and elephants were also found. 



CHAMPLAIN DEPOSITS OF SOUTHERN NEW ENGLAND. 



Professor Dana, in continuation of his essay upon the ge- 

 ology of the vicinity of Hartford, Connecticut, published in 

 the Journal of Science, remarks that there are three promi- 

 nent facts indicated by the Champlain deposits of Southern 

 New England. First, the occurrence of a vast flood during 

 the closing part of the melting of the glacier, in which other 

 parts of New England participated ; second, the absence of 



