Antliracitc Coal i?i Arizona. — Blake. 345 
ANTHRACITE COAL IN ARIZONA. 
By William P. Blake, Tucson, Arizona. 
Beds of graphitic anthracite coal occur in the mountains 
of the southeastern portion of Arizona. They crop out in 
considerable magnitude in the Chiricahua range of mountains 
near the bold summit, known as Cochise's Head, south of old 
camp Bowie, and about thirty miles from the Southern Pacific 
railroad at Teviston. The chief exposures are near Bridger's 
camp, at the head of Wood creek. The beds are there in close 
association with shales, sandstones, limestones and massive 
conglomerates, in regular strata, resting upon or against a 
crystalline gneissic and granitic foundation. The stratified 
formations are believed to be Carboniferous in age and the 
coal is presumably a member of the series but its exact rela- 
tions stratigraphically have yet to be satisfactorily shown. 
The sequence of strata appears to be: conglomerate, lime- 
stone, sandstone (quartzyte), black silicious shale, coal, shales, 
plutonic dyke, gneiss. The stratified formations attain a 
thickness of 2,000 feet or more. The limestones are largely 
developed, and are generally blue and but little changed. They 
contain encrinites and here and there brachiopod shells, ap- 
parently Productus. Other portions of the rock have been 
altered to white sub-crystalline beds. There is an abundance 
of flint nodules and layers of flint. The strata dip northward 
at various angles but generally less than 45°. 
The coal beds crop out in a ravine. They have not been 
much explored and some of the tunnels in which it is claimed 
that three beds were cut have caved in so as not to be acces- 
sible, but the great heaps of slaked coal and black dust at 
the mouths of such tunnels show that the material was found 
in quantity. The only accessible opening showed a thickness 
of glossy black graphitic anthracite over twelve feet in thick- 
ness. It reminds one of the hard graphitic anthracite of 
Rhode Island, but, except in selected specimens, it appears 
to carry more ash than the Rhode Island samples and to be 
even less available for 'fuel. It is hard to ignite. The per- 
centage of ash is large, as Avill be seen from the following tabu- 
lated results of analyses made by me in the laboratory of the 
Arizona School of Mines: 
