NO. 5 



HEXAHEDRITES HENDERSON 



19 



The Keen Mountain, Va., specimen appears to be much younger 

 than the others. Henderson and Perry (1958) assumed that this 

 meteorite was a relatively recent fall because it had a fresh-looking 

 black fusion crust with flight markings. Sections cut through one 

 end showed numerous small open fractures extending into the interior 



82° 



80 



92' 90 8^ 86^ 84" 



Fig. 4. — Geographic distribution of hexahedrites in table 6. The Cincinnati 

 iron is omitted for reasons given on page 18. 



only slightly farther than the thermally heated zone around its 

 surface. Since these fractures contain little brown iron oxide and 

 since this oxide is poorly consolidated, it was estimated by Gordon 

 Davis (personal communication) and Henderson and Perry (1958) 

 that the meteorite may have fallen between 1940 and 1950. Using 

 Ar^® measurements, Vilcsek and Wanke (1962) reported the time 

 of fall to be about 900 years ago. 



