NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 343 



Feet Meters 



Below this there are i6o feet (48.8 m.) of thick, 

 soHd layers and then 570 feet ( 173-7 ni.) of thick- 

 bedded, bluish-gray, compact limestones, breaking 

 down into thin layers and small angular fragments on 

 debris slopes. In cliffs, alternating bands of dark, 

 bluish-gray, and buff color indicate blue limestone 

 and bands of magnesian limestone. 



Total thickness of i 1,270 387.1 



Fauna. — None found. 



2a. Massive-bedded, hard gray limestone, with a bed of 

 slabby limestone about 10 feet (3 m.) thick 50 feet 



(15.2 m.) from the top 220 67.0 



Fauna. — 170 feet (Si.8 m.) from base (64d) : 

 LingidcUa sp. 



Dcndrograplus ramosissimus Rued. 

 Mastigograptns viacrothcca Rued. 



2rf. Thin-bedded, gray, somewhat granular limestone 12 3.7 



Fauna. — A small fauna was collected at about this zone 

 on the north side of the canyon from blocks of lime- 

 stone that had fallen out of the cliff. It includes (64I) : 

 IVinianclla occidcns Walcott 

 Hyolithes sp. 

 Pelagiella sp. 

 2c. Massive-bedded, hard, gray limestone, with some softer, 



finely granular thin layers in the massive layers 198 60.3 



Fauna. — 6 feet (1.8 m.) above base of \c two species of 

 Anomocarella ? occur (65i). 



Total of 2 430 1310 



Total thickness of Lyell 1,700 518.1 



Sullivan Formation ' 



la. Hard, gray, semi-crystalline, rather coarse limestone 

 with bands of shale of varying thickness between 



them 325 9g.o 



Fauna. — Numerous fragments of trilobites occur in many 

 of the layers and on the south side of the Glacier Lake 

 Valley, some good specimens were found about 200 feet 

 (60.9 m.) from the top (64k) : 



Crinoidal fragments 



LingulcUa issc Walcott 



Dicellomus sp. 



Hyolithes 2 sp. 



Conaspis sp. 



Dokimoccphalus sp. (Free cheek) 



* This part of the section was measured down a ravine, leading up to Sulli- 

 van Peak, I mile (1.6 km.) below foot of Southeast Lyell glacier on north side 

 of Glacier Lake canyon valley, and on south slope of the ridge capped by 

 Survey and Sullivan Peaks between Glacier Lake and the Valley of Lakes to 

 the north. 



