OBOLIDiE. 493 



associated with, a species of Bathyurus much like tliat from the beds containing Lingulella 

 desiderata at Trout Creek. 



Formation and locality. — Lower Ordovician: (360) Red siliceous limestone near Colorado Springs; (186) near 

 line of contact between red and gray Ordovician limestones, in red siliceous limestone about 30 feet (9.1 m.) above 

 the pre-Cambrian rocks, Williams Canyon, Manitou; (187) red siliceous limestone 105 to 122 feet (32 to 36.7 m.) above 

 the pre-Cambrian rocks, 2 miles (8.2 km.) below Manitou Park Hotel; (360a) red siliceous limestone on west side of 

 Trout Creek, below Bergen Park, 7 miles (11.2 km.) north-northwest of Manitou; all in El Paso County, Colorado. 



(360b) Red siliceous limestone on Cement Creek, 3 miles (4.8 km.) north of Hot Springs, Ouray County; and 

 (360c) red siliceous limestone about 10 miles (16.1 km.) southeast of Crested Butte, Elk Range; both in Colorado. 



Upper Cambrian: (161) Limestone on the south side of West Gallatin (Gallatin) River, northwest of Hamilton, 

 on the north side of the Gallatin Valley, Gallatin County, Montana. 



(7x, 7y, and 7z) Limestone of the Emigrant formation [Turner, 1902, p. 265], about 2.5 miles (4 km.) southeast 

 of the summit of Emigrant Pass, Silver Peak quadrangle (U. S. Geol. Survey), Esmeralda County; (8n) limestone 

 about 500 feet (152 m.) up in the limestones east of Swallow Ranch, west side of Snake Range, 20 miles (32.2 km.) 

 south of Osceola, White Pine County; (313) limestone 0.75 mile (1.2 km.) east-northeast of McGill post office, ^^^lite 

 Pine County; and (61) limestone in the Dunderberg shale [Walcott, 1908f, p. 184], a little south of the Hambui'g mine, 

 Eureka district [Hague, 1892, Atlas], Eureka County; all in Nevada. 



(301i) About 350 feet (106.7 m.) above the Middle Cambrian and 2,950 feet (899.2 m.) below the top of the Upper 

 Cambrian near the base of the arenaceous limestones forming 2a of the Orr formation [Walcott, 1908f, p. 177]; and 

 (30j and 30k) 950 and 1,150 feet (289.6 and 350.5 m.) above the Middle Cambrian and 2,450 and 2,175 feet (746.8 and 

 662.9 m.) below the top of the Upper Cambrian, in the arenaceous shales and limestone forming le of the Orr forma- 

 tion [Walcott, 1908f, p. 176]; all on Orr Ridge, about 5 miles (8 km.) south of Marjum Pass, House Range [Walcott, 

 1908f, PI. XIII], Millard County, Utah. 



(15d) " Thin-bedded blue limestone near Cave Spring on the east side of the Fish Spring Range, about 4 miles 

 (6.4 km.) south of the J. J. Thomas ranch, Juab County; (34t) limestone 1.5 miles (2.4 km.) northwest of Wahwah 

 Springs, about 80 feet (24.4 m.) below the highest point on the north side of the road at Cane Pass, Wahwah Moun- 

 tains, Beaver County; (32g) about 2,575 feet (784.9 m.) above the Cambrian quartzitic sandstones in a blue limestone 

 about 2 miles (3.2 km.) southeast of Muskrat Springs on the northwest face of Grantsville Peak, Stansbury Range, 

 Tooele County; (54j) about 700 feet (213.4 m.) above the Middle Cambrian and 525 feet (160 m.) below the top of the 

 Upper Cambrian in the arenaceous limestones forming 2c of the St. Charles formation [Walcott, 1908f, p. 192], in 

 Blacksmith Fork Canyon, about 10 miles (16.1 km.) east of Hyrum, Cache County; all in Utah. 



(5a and 54t) Limestones of the St. Charles formation [Walcott, 1908a, p. 6] about 250 feet (76 m.) above the Middle 

 Cambrian on the north side of Twomile Canyon, near its mouth, 2 miles (3.2 km.) southeast of Malade, Oneida County, 

 Idaho. 



(93 and 93o) Shales and limestones at the base of the Knox dolomite near Jordan's, just below the ford on Cowan 

 Creek, about 8 miles (12.8 km.) southeast of Center; (93a) *> same horizon as Locality 93 on Terrapin Creek road from 

 Center to Amberson; (94o) same horizon as Locality 93, 0.25 mile (0.4 km.) beyond Givens Ford, on Cowan Creek, about 

 8 miles (12.8 km.) southeast of Center; and (94xx) same horizon as Locality 93 at Givens mill, on Cowan Creek, about 

 8 miles (12.8 km.) southeast of Center; all in Cherokee County, Alabama. 



(361) Shaly limestone in suburb of Attalla, Etowah County, Alabama. 



(96) Limestones near the ford on the Cedartown road, 1.5 miles (2.4 km.) south of Rome, Floyd County; and 

 (362) shales in the Oothkalooga Valley, Bartow County; both in Georgia. 



(107u and 107o) Limestones and shales at the base of the Knox dolomite, west of the top of Copper Ridge, near 

 the Southern Railway cut, about 10 miles (16.1 km.) northwest of Knoxville [Keith, 1896b, areal geology sheet], Knox 

 County, Tennessee. 



(122a)'' Shale at the headwaters of Forgey Creek, northwestern part of the Greeneville quadrangle (U. S. Geol. 

 Survey), Hawkins County, Tennessee. 



Upper? Cambrian: (56) Limestone at Sierra Springs, eastern base of Lookout Mountain, Eureka district [Hague, 

 1892, Atlas], Eureka County, Nevada. 



Middle? Cambrian: (313c) Limestone about 12 miles (19.3 km.) west-southwest of Alpha Station, Em-eka County, 

 Nevada. 



Middle Cambrian: (57) Shaly Eldorado limestone [Walcott, 1908f, p. 184] at the 700-foot (213.4 m.) level of the 

 Richmond mine, Ruby Hill [Hague, 1892, p. 43, and PL I, opposite p. 116]; (57b) limestones at the north end of Mineral 

 Hill, just south of Ruby Hill [Hague, 1892, p. 43, and PL I, opposite p. 116]; (60) limestones in upper beds of Secret 

 Canyon shale, across the canyon from the dump of the old Richmond mine shaft; and (58) shaly limestones in upper 

 beds of Secret Canyon shale, east side of New York and Secret canyons; all in the Eureka district [Hague, 1892, Atlas], 

 Eureka County, Nevada. 



(313b) Limestone 3 miles (4.8 km.) north-northeast of Schellbourne, Schell Creek Range, White Pine County, 

 Nevada. 



a This species also occurs at Locality 34i (p. 196). 



b The species is somewhat doubtfully identified from this locality, 



c This species also occurs at Locality 122 (p. 223). 



