NO. I FORMATIONS OF BEAVERFOOT-BRISCO-STANFORD RANGE 23 



from the top of No. 3, a number of gasteropods and '^'^^ Meters 

 other fossils were found. These include (locality i/z) : 

 Cyrtolites sp. 

 Ozarkispira 

 Raphistoma ? 

 Agnosfus sp. 

 Hystricurus sp. 

 Bellefontia sp. 

 At 125 feet (38.1 m.) above the base of No. 3, a compact, 

 hard, gray limestone (i7y') contains fragments of the 

 Hungaia faunule, and they continue nearly to the base. 

 About 50 feet (15.2 m.) above the base the faunule 

 included (locality ijy) : 



Oboiiis tetoncnsis Walcott 

 Lingulella renins Walcott 

 Hungaia sp. 

 In a broken section on the north side of Dry Creek this 

 zone gave (locality I7w) : 



Obolus sp. undt. 

 Eoorthis putillus Walcott 

 Hungaia sp. 

 At the base of the Hungaia zone of this section, about 

 125 feet (38.1 m.) belov^r 17W, afforded (i/w') : 

 Obolus sp. 

 Agnostus sp. 

 cf. Conaspis sp. 

 Hungaia sp. 



4. A thick layer of hard, dove colored limestone 6 to 8 feet 



(1.8 to 2.4 m.) thick on the line of the section, was 

 assumed to mark the base of No. 3 ; below it there is a 

 thick series of alternating bands of shale and limestone, 

 the latter mostly small irregular nodules and bits of 

 rolled limestone shale (intraformational conglomerate). 

 Thin, even layers of hard, gray limestone also occur 

 irregularly in the shale and with the thicker layers. 

 There is much similarity between the layers above No. 3 

 and this series 875 266.7 



Fauna. — Fragments of the tests of trilobites are abundant 

 in many of the layers of limestone, but it was only in 

 the lower part that recognizable species were collected. 

 These indicate the basal beds of the Symphysurina zones 

 of the Sinclair Canyon section. 



A local sigmoid flexure occurs in the strata of this series 

 (4), but by carrying the section east of it, duplication 

 of beds was considered to be avoided. 



5. Alternation of thick (18 to 30 inches, 45.7 to 76.2 cm.) 



and thin (.25 to 3 inches, .6 to y.6 cm.) layers of hard, 



close grained, dark gray limestone 195 59.4 



6. Greenish argillaceous shale with a few interbedded layers 



of dark gray limestone 45 13.7 



