MERRILL] METEOR CRATER OF CANYON DIABLO, ARIZONA 497 



and important data, and Mr. Tassin, of the Division of Mineralogy, 

 has allowed the use of his unpublished chemical notes. 



The investigations in the field were conducted under the auspices 

 of the Smithsonian Institution. A set of specimens of the meteoric 

 irons, altered sandstones, and associated products has been deposited 

 by Messrs. Barringer and Tilghman in the U. S- National Museum, 

 where it is now on exhibition. 



U. S. National Museum, November, 1907. 



EXPLANATION OF PLATES 



Plate LXI 



Fig. 1. View of crater rim from the northeast. 

 2. View of crater rim from the south. 



Plate LXII 



Fig. I. View on outer slope of east rim of crater, looking southward. 



2. A limestone boulder on outer slope of east rim of crater. Dimensions, 

 148 feet in circumference at the ground, 23 feet high on west side, 

 30 feet high on east side. Approximate weight, 3,000 tons. 



Plate LXIII 



Fig. 1. View looking northward along crest of west rim of crater. 



2. View looking northward along crest of west rim of crater, showing 

 width of crest. 



Plate LXIV 



Fig. I. View looking across the crater; from low place in northern side of 

 rim. 

 2. View looking across and into the crater; from the south. 



Plate LXV 



Fig. 1. Near view of interior wall of crater, looking northward. 



2. View looking across the crater from the north and showing the fault- 

 ing (directly beneath arrow) in southern rim. 



Plate LXVI 

 Contour map of crater 



Plate LXVII 



Fig. 1. Dry wash on south side of outer rim, showing seven-foot bank of 

 rock-flour. 



2. Whale Rock, a limestone boulder on outside of west rim. Dimensions, 



88 feet in circumference at the ground and 38 feet in maximum 

 height. Approximate weight, 1,500 tons. 



3. Largest boulder on rim of crater, west side. 



