1880.] NEW YOUK ACADEMY OF SCIENCES. 123 



enabling ns to study as if by niiificial sections. Kcd Mt. Range 

 extends from Silvei-ton to the bi'idgc over the Unconipahgre 

 River, two and a half miles south from Ouray. At tlie divide 

 between Mineral Cicek and Red Mt. Creek, we encouiiler tlie 

 rich mines of the Yankee Gii'l group. The jirodiiction of silver 

 from this district bas been this year $3,000,100. 



Fici. 1.— Bear Mt. 

 S, Horizontal sandstone; T, Trachyte. 



Mears's road sbows no other rocks than those of Red Mt. and 

 Mineral Creek, until we ajiproach the village of Ironton. Here 

 we see altered sti-atitled lock. To the north of the creek rises 

 the Sneffles grou]i, high, bold, and projected on the sky. 



Owing to its various colors, deep and pale red, purple and yel- 

 low, contrasted with the deep brown of tlie cliffs, Red Mt. 

 forms one of the most picturesque objects of the region, and is 

 scarcely equalled elsewhere. If we proceed up the Animas by 

 the eastern route to Ouray, we find in all the mountain^ passed 

 only one locality where we can identify the original rock. This 

 is at Denver Hill, where we find altered black slate, probably the 

 same as that which is seen at Bear Creek Falls. In going up 

 the Animas river, we pass by many mountains — King Solomon, 

 with its North Star mine. Galena Mt., witii its galena veins. 

 Round Mt., Jones, Grouse, Crown, Cinnamon, Wood Mt., the 

 highest of all, 14,600 feet, Sigel, and, finally, at the head of 

 Animas Creek, Engineer Mt. All these lie between the head 

 waters of the soutli fork of the Gunnison, the Animas, and the 

 sources of the Rio Grande. 



On the left hand going up the Animas we have the south end 

 of Red Mt., Anvil Rock, Boulder Tower, Eureka, and Boneta, 

 at the head of Cement Creek; also Treasure, California, Brown, 

 Hurricane, Mineral Lake, and Denver Hill. Each of these 

 mountains has some peculiar ores belonging to itself. Galena is 

 rich in lead ores, Boneta in gold, Eureka in sulphides of copper 

 and iron, with zinc and tin. At Eureka mural cliffs rise nearly 



