344 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



lb. Hard, gray, finely arenaceous shale, with interbeclded 

 layers of hard, gray limestone in the upper portion of 

 the 370 feet (12.8 m.) of shale. 



Below, the interbedded limestone layers become 

 more numerous, and extend down about 85 feet 

 (25.9 m.). They are from 2 to 3 feet (.6 to .9 m.) 

 thick and form little ledges in the shale. 

 Fauna. — (64h) : a few layers of hard, gray, rather crystal- 

 line limestone occur, with numerous fossils, 107 feet 

 (32.6 m.) from the base, similar to those in (64k) 

 of la above. Fine, arenaceous, drab-weathering shale 

 extends down to the base of ib. 



Total of lb 975 297.2 



ic. Hard, gray arenaceous shale 78 23.8 



At the top a few layers of interbedded, oolitic lime- 

 stone occur which contain beautifully preserved 

 Dicellomus. 

 Fauna. — (64g) : 



Crinoidal fragments 

 Dicellomus sp. 

 Lingulella sp. 

 Agnostus sp. 

 In the shaly layers interbedded with the limestone, 

 the following were collected (64g') : 

 Dicellomus sp. 

 Linguleila isse Walcott 

 About 4.5 miles (7.2 km.) east of locality (64g), 

 on the south slope of Survey Peak, the following 

 species were collected from the shale and interbedded 

 limestone of ic (646) : 



Dicellomus sp. 

 Lingulella isse Walcott 

 Crcpicephalus sp. 

 id. Shaly and thin-bedded, hard, gray sandstone weath- 

 ering rusty brown; a few layers near the top are 

 from 4 to 12 inches (10.2 to 30.5 cm.) thick 62 18.9 



Total of Sullivan formation 1,440 438.9 



The shales and interbedded limestone layers break 

 down readily and usually form a sloping terrace on 

 the mountain-side. 

 Section of part of la in more detail. — A few layers of the 

 upper part of la of the section were exposed, by the 

 melting back of the glacier on the north side of the 

 canyon, at the foot of a cliff between an old moraine 

 and the foot of East Lyell glacier, where there is 

 a section of a portion of la of the Sullivan forma- 

 tion that is of interest on account of the contained 

 fauna. Beginning at the top the exposed section 

 includes : 



