364 CAMBRIAN BRACHIOPODA. 



feet (61 m.) above the Lower Cambrian [see Walcott, 1908f, p. 171], 0.25 mile (0.4 km.) below the Ma,xfield mine, in Big . 

 Cottonwood Canyon, on the west front of the Wasatch Mountains southeast of Salt Lake City, Salt Lake County; (30a) 

 shale on the north side of Big Cottonwood Canyon, 1 mile (1.6 km.) below Ai'genta, in the Wasatch Mountains southeast 

 of Salt Lake City, Salt Lake County; and (541) about 500 feet (152.4 m.) above the Brigham quartzite and 3,700 feet 

 (1,127.8 m.) below the Upper Cambrian in the Spence shale member of the Ute limestone [Walcott, 1908f, p. 197], in 

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



(31) Shales at the Chisholm mine; and (333 [Pack, 1906, p. 296]) shales at the Abe Lincoln mine; both on the 

 southwest slope of the Ely Mountains, 3 miles (4.8 km.) northwest of Pioche, Lincoln County, Nevada. 



(73a) "Tonto" sandstone in Chuar Valley; and (74) sandstone about 300 feet (91.4 m.) above the base-of the 

 Tonto group, at the head of Nunkoweap Valley; both in the Grand Canyon of the Colorado, Arizona. 



(14) Limestones overlying the sandstones of the Rome formation, near the wagon road and in a quarry near the 

 railroad track, 7 miles (11.2 km.) southwest of Rome, Floyd County, Georgia. 



(101) Rogersville shale, just above the road in the hill west of the schoolhouse, 3.5 miles (5.6 km.) southwest of 

 Rogersville on the road to Melinda Ferry [Keith, 1896a, areal geology sheet], Hawkins County, Tennessee. 



lower Cambrian: (57r and 58s) About 150 feet (46 m.) below the Middle Cambrian near the base of the limestones 

 forming 3 of the Mount Whyte formation [Walcott, 1908c, p. 241 (10)]; and (35f)a about 300 feet (91 m.) below the 

 Middle Cambrian in the limestone forming 6 of the Mount Whyte formation [Walcott, 1908c, p. 242 (11)]; both just 

 above the tunnel on the north shoulder of Mount Stephen, about 3 miles (4.8 km.) east of Field, British Columbia, 

 Canada. 



(41) Limestone in the Pioche shale [Walcott, 1908a, p. 11], on a ridge 2.5 miles (4 km.) northwest of the town of 

 Cherry Creek, White Pine County; (30) limestone 8 miles (12.8 km.) north of Bennetts Spring, on the west slope of 

 the Highland Range, Lincoln County; and (31a) limestone interbedded in the Pioche shale [Walcott, 1908a, p. 11], just 

 above the quartzite on the east side of the anticline, near Pioche, Lincoln County; all in Nevada. 



(34) Limestone on roadside a little west of the bridge over Poultney River at Low Hampton, about 5 miles 

 (8 km.) east-northeast of Whitehall, Whitehall quadrangle (U. S. Geol. Sm-vey), Washington County; (38a) lime- 

 stone 2 miles (3.2 km.) south of North Granville, on the road which turns south from the road running between that 

 village and Truthville, 4 miles (6.4 km.) west-northwest of Granville, Fort Ann quadrangle (U. S. Geol. Survey), 

 Washington County; and (44b) limestone near North Chatham in the northern part of the Kinderhook quadrangle 

 (U. S. Geol. Survey), Columbia County; all in New York. 



(4v) About 200 feet (61 m.) above the unconformable base of the Cambrian and 75 feet (22.9 m.) above the top 

 of the quartzitic sandstones in a shale which corresponds in stratigraphic position to shale No. 6 of the Dearborn 

 River section [Walcott, 1908f, p. 202], Gordon Creek, 6 miles (9.6 km.) from South Fork of Flathead River, 

 Ovando quadrangle (U. S. Geol. Survey), Powell County, Montana. 



Specimens that are somewhat doubtfully referred to this species occur at the following 

 localities : 



Middle Cambrian: (55c) Spence shale member of the Ute limestone [Walcott, 1908a, p. 8], about 50 feet (15.2 m.) 

 above the Brigham quartzite, and 2,755 feet (839.7 m.) below the Upper Cambrian, in a ravine running up into Danish 

 Flat from Mill Canyon, about 6 miles (9.6 km.) west-southwest of Liberty and 15 miles (24.2 km.) west of Montpelier, 

 Bear Lake County, Idaho. 



(54(i) A drift block supposed to have come from the horizon of Locality 32x, a horizon correlated with the shales 

 forming 2d of the Bloomington formation in Blacksmith Fork Canyon [Walcott, 1908f, p. 195], in Wasatch Canyon, 

 east of Lakeview ranch, about 5 miles (8 km.) north of Brigham, Boxelder County, Utah. 



(13k) Shales of Matthew's [1903, p. 15] Coldbrook, above the great falls in Dugald Brook, Indian River, eastern 

 Cape Breton, Nova Scotia. 



MiCROMiTRA (Iphidella) pannula maladensis (Walcott). 

 '■' Plate IV, figures 2, 2a-g. 



Iphidella pannula maladensis Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, p. 306. (Characterized as a new variety.) 

 Surface covered with elevated, sharp, distinct ridges that give it an irregular, honeycomb- 

 like appearance. 



This form owes its varietal name to its occurrence near Malade, Idaho. 



Formation AND LOCALITY. — Middle Cambrian: (5b) Dark blue-gray Langston limestone [Wnlcott, 190Sb, p. 19S] just 

 above the Cambrian quartzitic sandstones, on the north side of Twomile Canyon, near its mouth, 2 miles [SS km.) southeast 

 of Malade, Oneida County, Idaho. 



(6g) Limestone near the base of the Middle Cambrian, the lowest horizon carrying Paradoxides, northwest side of 

 Chappie Arm Harbor about a mile (1.6 km.) from its head, Trinity Bay, Newfoundland. 



a This species is somewiiat doubtlully identified from this locality. 



