PROC. ACAD. NAT. SCI. FHlLA. 19 14. 



PLATE XXI. 





/I 



A 6RCAT QUfcNTllY OF jg StLlCA OR ROCK FLOUR 







(XPOitD HAIURALLY ^IN THIS ARROf A . SHAFTaN'XXTl '\ '"■-_^-^ I 



JS' SHAFT«H»XXXiy ^ ^A. 



£«^5; 



yic^l-faP^ 









GRtftlEST DIAMETER Of CRftTER WN.W. TO ES.t. BEING 4^50 FEET. 





'OSlOf^ 



BARRINGER: METEOR CRATER, ARIZONA. 

 Scale, 1290 feet = 1 inch. 



