382 



IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



meteorite found scattered about led to extensive mining operations, 

 the miners hoping to reach the great bulk of iron ore believed to 

 be in the pit bottom. Several things have operated to prevent 



Fig. ](»1. — View of the south wall of the crater from a point a little north- 

 east of the center of the bottom of the pit. 



Fig. 1(12. — All :iliaijcliinr(l iiiiirt.s' luiihliiiK in the liottoiii (if tlic crater lU'ur 

 the middle of the pit. 



success, one of the worst being the fine, wind-blown sand, at least 

 eight hundred feet deep in the crater, and which is very difficult to 

 keep out of the mining shafts, because being very dry and very fine, 

 it runs very freely. Another difficulty is lack of all timber in the 



