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NEW CRETACEOUS BRACHIOPODA 

 FROM ARIZONA 



By G. ARTHUR COOPER 

 U. S. National Museum 

 Smithsonian Institution 



(With Four Plates) 



Cretaceous brachiopods, except for the occurrences of Kingena in 

 Texas, are a great rarity in the United States, and it is also unusual 

 to find here more than one kind of brachiopod of that age in abun- 

 dance. However, in 1947, Dr. J. B. Reeside, Jr., of the U- S. Geologi- 

 cal Survey, called my attention to several species of brachiopods from 

 the Cretaceous Mural limestone of Arizona. These were insufficient 

 for study ; therefore, in the summer of that year I went to the Bisbee 

 area of Arizona with Dr. Ellis Yochelson, now of the U. S. Geological 

 Survey, to obtain more material. 



Occurrence of Cretaceous brachiopods in Arizona is mentioned by 

 Ransome (1904, p. 6) in his description of the Bisbee Quadrangle. 

 The single occurrence cited is said to be the only one on the quadrangle 

 and is a small hill on the east side of the quadrangle opposite the mouth 

 of Glance Canyon and about 3 miles east of Glance. This hill is in the 

 NW:|:SW^NE:^ sec. 36, T. 23 S., R. 25 E. and lies about 0.2 

 mile east of U. S. Highway 80 about 12.7 miles west-northwest of 

 Douglas, Cochise County. The location is thus easily accessible be- 

 cause of its proximity to an excellent road, and it is from this locality 

 that Dr. Yochelson and I collected the specimens described below. 



The low hill from which the brachiopods were taken consists of 

 massive limestone, through which the brachiopods are scattered. They 

 are not concentrated in bands, although some pieces were found in 

 which they were fairly common. A large part of the collection con- 

 sisted of small lumps showing one or two specimens. Although some 

 large pieces were taken, they were not rich and it was best, therefore, 

 to collect individual specimens or small groups in small pieces. The 

 limestone lumps taken produced few specimens aside from brachio- 

 pods. These included small oysters, small rudistids, and a few poorly 



SMITHSONIAN MISCELLANEOUS COLLECTIONS, VOL. 131, NO. 4 



