DETAILED STRATIGRAPHIC DISTRIBUTION. 



157 



Detailed stratigraphic distribution of Cambrian and Ordovidan Brachiopoda — Continued. 

 Utah: House Range, Millard County — Continued. 



House Range section. 

 [Walcott, 190Sf, pp. 173-1S5.] 



Localities and species in the 

 House Range section. 



Other localities and species in 

 Utah and Nevada sho\vn in 

 their approximate strati 

 graphic position. 



MIDDLE CAMBRIAN— continued. 



Swasey formation [Walcott, 1908a, p. 11]: a Feet, 



la. Oolitic and arenaceous limestone in massive layers near the 

 top. Below, some dark bluish-gray limestone is interbedded, 

 and gradually it becomes the principal rock; it breaks up on 

 weathering into irregular shaly layers J to 3 inches thick 152 



30b, 31w. 



Near the top: 



Platyceras—Slw . 



ZacanthoidesSlw. 

 Near the base: 



Scenella—SOh. 



Zacanthoides—SOh. 



Ptychoparia—ZOb. 



Dorypyge—iiOh. 



lb. Drab and reddish argillaceous shales, with Interbedded thin 



layers of fossiliferous limestone 63 



Ic. Dark bluish-gray limestone in massive layers that break up into 



irregular snaly layers i to 2 inches thick 17 



Id. Calcareous and argillaceous shales, with thin layers of gray lime- 

 stone 102 



llw, 30c. 



Micromitra {Paterina) labra- 

 dorica utaheiisis — 30c. 



Lingulella arguta — llw. 



Ptychoparia, 2 species — llw, 

 SOc. 



le. Bluish-gray limestone in layers 4 to 10 inches thick, with numer- 

 ous concretions from i^ to 1 inch in diameter in a few layers. . . 



Total of Swasey formation 



30d. 



Obolus (Westonia) ella — 30d. 

 Ptychoparia, 3 species— 30d. 



34u?. 



Obolus (Westonia) wasatcliensis- 



Dorae Canyon limestone [Walcott, 1908a, p. 11]: 6 



Massive-bedded cliff-forming gray siliceous limestone, with small specks 



ofcalcite. 100 feet from the top and for 50 feet below some layers 



of brownish-yellow arenaceous limestone 15 inches to 2 feet thick 



occur 



How ell formation [Walcott, 1908a, p. 11]: c 

 la. Bluish-black limestone in massive layers that break up on 



weathering into irregular thin layers 50 



Micromitra (Iphidella) pan- 



nula — 31v. 

 Acrotreta of. ophirensis — 31v. 

 Ptychoparia — 3 1 v . 



14t?, 33r?. 



Micromitra {Iphidella) pannula- 



14t. 

 Lingulella ci. similis — 14t. 

 A crotreta neboensis — 14t. 

 Otusia utahensis — 33r. 



1&. Gray siliceous limestone S 



Ic. Bluish-black limestone similar to la 105 



Id. Pinkish-colored argillaceous shale, with interbedded thin 



layers of limestone 10 



31s. 



Micromitra (Iphidella) pan- 



nula— Sis. 

 Obolus (Westonia) ella — 31s. 

 AcrotretacS. ophirensis — 31s. 

 Scenella — 31s. 

 Hyolithes — 31s. 

 Zacanthoides — 31s. 

 BathyuTiscus — 31s . 



3d, Us, 32h, 32j, 33z, 33f. 



Micromitra sculptilis — lis. 



Micromitra sp. — 3d. 



Micromitra (Paterina) labradorica 



utahensis — 3d. 

 Obolus (Westonia) ella — 3d, lis, 



32h,32z. 

 Obolus (Westonia) ella onaquien- 



5i5— 33f. 

 Acrotreta ci. ophirensis — 32j. 

 Olenoides?—Sd. 

 Bathyuriscus sp.— 32h, 32z. 



le. Gray siliceous limestone in layers 2 to 10 inches thick. 



If. Bluish-black limestone in massive layers, breaking up into thin 



layers on weathering 102 



30f. 



Ptychoparia — 30f. 

 Bathyuriscus— SOf. 



a Section exposed on the southwest ridge of Swasey Peak. 



b Section exposed in the central portion of Dome Canyon and adjoining cliffs. 



c Section exposed on the west face of the House Range at Howell Mountain. 



