1044 | General Notes. [ December, 
basin described at the Buffalo meeting in another paper) and ex- 
tending as far as the confines of a depressed area which was 
caused by faulting in the trachytic period. These zones are tra- 
versed by central, nearly vertical veins (“parent fissures,” as I 
have elsewhere styled them), bounded upon each side by veins 
converging laterally and from above downwards. The mid-ribs 
are free-gold bearing, and they represent three trends intersecting 
near Red peak. These trends are about N. 80° E., N. 38° E. 
and N. 38° W. The zones vary in width, but between each two 
there is a barren belt of greater or less breadth. Beginning at 
the north we have (1) the arsenical zone, characterized by miner- 
als carrying high percentages of arsenic; (2) the ġismuth zone; 
(3) the galena-gray copper zone; (4) the antimonial zone, practi- 
cally the prolongation south-westward of the arsenical wedge; 
(5) the argentiferous-galena zone, opposite the bismuth wedge, | 
and ‘6) the su/phuret zone, a wide area with few veins, but these 
rich and carrying true silver minerals (sulphides) largely. 
The faults and the vein-filling appear to have occurred subse- 
quently to the trachytic ejections but prior to the rhyolitic period. 
The evidence is that the gradual elevation of the Red peak focus 
caused the subsidence and faulting along the edges and across 
-two of the three stated radii of the depressed area, but that the 
deposition of the veins along the arsenical-antimonial trend was 
later than the rhyolitic period, or in its closing stages. After this 
the veins of the Red Mountain area were much modified by the 
secondary action of ‘hot springs and geysers. 
I have given here the mere outline of the facts, and but a small 
Comstock. 
A GIANT ARMADILLO FROM THE Miocene oF Kansas. The 
` 
