292 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet 



62 



Fauna. — (2od) : large Saukia, etc. 



Eurekia sp. 

 Dikelocephalus sp. 

 Illaenurus sp. 

 ic?. Thick-bedded, buff magnesian limestone similar to ib. . 

 le. Arenaceous shales, with thin layers of dolomitic and 



a few of gray limestone 45 



Fauna. — (20J) : 



Saukia sp. 

 Ptychaspis sp. 

 Irvingclla sp. 

 Conaspis sp. 

 if. Thick-bedded, gray, buff-weathering magnesian lime- 

 stone similar to lb and id 58 



Fauna. — At 30 feet (9.1 m.) down, the upper surface of a 

 thick layer (3 feet, .9 m.) is covered with the ends of 

 a columnar species of Collema similar to that at the 

 same horizon 1.5 miles (2.4 km.) to the north. 



Meters 



18.9 

 137 



17.7 



20 d 20 J 20 i 



Fig. 26. — Diagrammatic outline of the upper 400 feet (121. 9 m.) of the 



Lyell formation of the Tilted Mountain Brook section. Three fossil zones 



of the section are indicated by the locality numbers (20d), (2oi), (20J), and 



the divisions of the section by number and letter, 10 to im. 



Locality. — About one mile (1.6 km.) east of the base of F on map, plate 26. 



Mounfam 



Devonian 



Lyell 



Baker Creelo 



Canyon Valley 



Mons 



Fig. 27. — Diagrammatic outline of section on south side of Tilted Mountain 

 Cirque from the Mons down through the Lyell, Bosworth, Arctomys,' and 

 Eldon formations to a fault separating the latter from the Devonian lime- 

 stones (see pis. 52-55). 



Feet In. Meters 



\g. Arenaceous shales with thin layers of bluish-gray lime- 

 stone 6 1 .8 



ill. Irregularly-bedded gray limestone in layers of varying 

 thickness. The three layers composing it are 3 feet 



