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Some Fossils from the Lower Aubrey and Upper Red AVall 

 Limestones in the Vicinity of Fort Apache, Arizona. 



By Albert B. Reagan. 



The Fort Apache region, Arizona, is the home of the White Mountain 

 Apache Indians. The region, as described in the November number of the 

 American Geologist for 1903. is included between the parallels 33° 15' and 

 34° 15', and the meridians 109° 30' and 111°. In this region, practically 

 all the geological ages are represented from the Archteau to recent. The 

 Carboniferous Age. to which the fossils belong, is represented by the 

 Aubrey and Red Wall gioups (if locks. Eacli (if These groups is sepa- 

 rated geologically and stratigraphically into two divisions; the Aubrey 

 into the Upper and Lower Aniirey. and the Red AVall into the Upper and 

 Lower Red Wall. The fossils were collected from the Upper Red Wall 

 and Lower Aubrey divisions. Those from each division were collected 

 separately, and their exact position will be given in the description. 



FUSULINA FISCHER (18.'">7). 

 FUSULIXA SEC A Lie A. 



Plate, Figs. 1 a, b. 



AVliite's description (in parti: Shell varying from terete to subglobose, 

 assuming all intermediate fusiform shapes, generally somewhat obtusely 

 pointed, usually having the appearance of being slightly twisted at the 

 ends; septal furrows moderately distinct, extending in more or less direct 

 lines longitudinally, but are a little deflected .iust at the ends; centrifugal 

 apertures about twice as high as the thickness of the cell-wall covering 

 them, more than twice as broad as high, and of nearly uniform size 

 throughout the whole coil. 



The locular or external aperture is seldom clearly shown upon the 

 fossils. It Avas apparently linear the full length of the shell until closed 

 by a new longitudinal septum at each side, leaving only a new centrifugal 

 aperture at the middle, in line with the others. Volutions from five to 

 eight: septa from twenty to thirty in (inter volution; septa nearly straight 

 at their outer or external edges, liut laterally undulating at their inner 

 «idges. where they join the outer surface of the next volution within. 



