NO. 5 



PRE-DEVONIAN PALEOZOIC FORMATIONS 



Feet 



la. Massive bed of hard, compact, dark gray limestone, 

 with stringers and lamellae of buff -weathering magne- 

 sian limestone more or less parallel to the bedding 



Fautia.— The only trace of anything of possible organic 

 origin is the occurrence of vertical slender columns 

 from I to 3 inches (2.5 to 7-6 cm.) in diameter of 

 clear, bluish-gray limestone, either single or bifur- 

 cating upwards as two branches. The lamellae of the 

 layer are interrupted by the columns except near the 

 top where they arch over them. These column3 sug- 

 gest a Colloiia-Uke structure such as occurs in the 

 Lyell formation of the Tilted Mountain section 

 (see p. 291). 



345 



Meters 



27 



Fig. 32. — Diagrammatic sketch of a suppos- 

 edly fossil algal growth of Collcnia-\ik& form 

 similar to those from the upper part of the 

 Lyell limestone. It occurs in the upper part of 

 the limestone series referred to the Sullivan 

 formation. 



Locality. — At B on map, plate 26. Low cliff 

 east of the lower lateral moraine of southeast 

 Lyell glacier, which is about 50 miles (80.5 km.) 

 northwest in an air line of Lake Louise Station, 

 Alberta. 



Jb. Massive-bedded, compact, gray limestone, with thin hori- 

 zontal stringers of buff-weathering magnesian lime- 

 stone distributed in a very irregular manner 



Fauna. — A few fragments of trilobites scattered through. 



If. Massive-bedded, gray limestone, with more or less 

 closely packed concretions one to two centimeters in 

 diameter and fragments of trilobites 



id. Compact, gray limestones in two massive beds that 

 weather light gray. Traces of small magnesian con- 



34 



9-5 



10.2 



2.8 



