LOCALITIES. 



213 



70(=70aaiid70e) 

 Obolus sinoe. 

 Lingulella acutangula. 

 Lingulella perattenuata. 

 *Lingulella texana. 

 Lingulella (Lingulepis) acuminata. 

 Billingsella coloradoensis. 

 Capulus?. 

 Cystidean plates. 

 Ptychoparia diademata (Hall) 

 Ptychoparia pattersoni Hall. 



Upper Cambrian: Limestone near Morgans Creek, Burnet County, Tex. (C. D. Walcott, 

 Ptychoparia perseus Hall var. 

 Ptychoparia romerei (Shumard). 

 Ptychoparia suada Walcott. 

 Ptychoparia wisconsinensis (Owen). 

 Agraulos convexus Whitfield. 

 Anomocare pero (Walcott). 

 Pterocephalia sancti-sabae Roemer. 

 Chariocephalus tumifrons Hall and Whitfield. 

 Ptychaspis granulosa (Owen). 



70a (=70). 

 Billingsella coloradoensis. 

 nisenurus? dia Walcott. 

 Ptychoparia occiden^ Walcott. 



70e (=70). 

 Lingulella acutangula. 

 *Acrotreta microscopica. 

 Billingsella coloradoensis. 



71. Upper Cambrian: Limestone in Cold Creek 

 Obolus matinalis. 

 Obolus sinoe. 

 Acrotreta microscopica. 

 Billingsella coloradoensis. 

 Eoorthis iddingsi. 

 Eoorthis indianola. 

 *Eoorthis remnicha texana. 



Ptychoparia wisconsinensis (Owen). 

 Dikellocephalus belli Billings. 

 Dikellocephalus minnesotensis Owen. 



Burnet County, Tex. (C. D. Walcott, 

 Eoorthis wichitaensis. 

 Huenella texana. 

 *Huenella texana Iseviusculus. 

 Ptychoparia affinis (Walcott). 

 Ptychoparia wisconsinensis (Owen). 

 Agraulos convexus Whitfield. 

 Anomocare pero (Walcott). 



72 (same horizon as 72a). Lower Cambrian: Limestone 5 miles (8 km.) east of Albany, Rensselaer County, N. Y. 

 (C. D. Walcott and T. N. Dale, 1893). 

 Obolus prindlei. 



72a (same horizon as 72). Lower Cambrian: Limestone 1 mile (1.6 km.) southwest of Wynantskill, Rensselaer 

 County, N. Y. (L. M. Prindle, 1893). 

 *Obolus prindlei. 



73. Middle Cambrian: Sandstones of the Tonto group in Kwagunt Valley, Grand Canyon of the Colorado, Ariz. 



(C. D. Walcott, 1882). 

 Obolus (Westonia) chuarensis. 

 *Lingulella lineolata. 



V; ■ 



73a. Middle Cambrian: "Tonto" sandstone in Chuar Valley, Grand Canyon of the Colorado, Ariz. (C. D. Wal- 

 cott, 1882). 

 *Micromitra (Paterina) superba. I *Obolus (Westonia) chuarensis. 



Micromitra (Iphidella) pannula. | Lingulella lineolata. 



73b. Middle Cambrian: Sandstone in upper part of the Tonto group, lower portion of Kwagunt Valley, Grand 

 Canyon of the Colorado, Ariz. (C. D. Walcott, 1882). 

 Micromitra (Paterina) crenistria. 



74. Middle Cambrian: Sandstone about 300 feet (91.4 m.) above the base of the Tonto group at the head of 



Nunkoweap Valley, Grand Canyon of the Colorado, Ariz. (C. D. Walcott, 1882). 



Micromitra pealei. 

 *Micromitra (Paterina) crenistria. 

 Micromitra (Paterina) superba. 

 Micromitra (Iphidella) pannula. 

 *Obolus zetus. 



Obolus (Westonia) chuarensis. 

 *Obolus (Westonia) euglyphus. 

 Lingulella lineolata. 

 Lingulella perattenuata. 

 *Billingsella obscura. 



74b. MiddlQ Cambrian: Sandstone 1,000 feet (305 m.) above the base of the Tonto group, Nunkoweap Valley, 

 Grand Canyon of the Colorado, Ariz. (C. D. Walcott). 

 Obolus (Westonia) chuarensis. 



