Report of National Museum, 1 893. — Merrill, 



Plate 5. 



Slab of Green Onyx Marble with veins of ochreous brown. 



Cat. No. 67540. U. R. N. M. Mayers Station. Arizona. 

 Tliis siiecinifu and those .shown in plates (] and 7 were cut from the same block, to show various stages 



of o.xidatiou. 



