NO. 5 PRE-DEVONIAN PALEOZOIC FORMATIONS 339 



and of the west ridge (right) about 9,200 feet (2,804.2 m.). The 

 spurs to the left are from the northeast slope of Mount Forbes and 

 the north slope of Mount Outram (10,670 feet, 3,252 m.), a peak 

 about 3 miles (4.8 km.) east-northeast of Mount Forbes. (PI. 87.) 



The glacier in the foreground is the lower section of Southeast 

 Lyell glacier, and that above to the right is Mons glacier. The waters 

 from the two glaciers and the snow-fields of the pinnacles unite to 

 form Glacier River. The geologic section was measured approximately 

 along the white dotted line from below the cliff at the base of the 

 north spur of Mount Forbes to the upper cliff of the northwest 

 spurs above Mons glacier. 



The position of the base of each of the Messines, Sarbach, Mons, 

 and Lyell formations is indicated ; also the approximate position of 

 the base of the Upper Cambrian Sullivan and Arctomys formations, 

 the two latter from comparisons made with the section on the opposite 

 (north) side of the canyon valley. 



The places at which fossils were collected are indicated on plate 87 

 by the letters A to K, and their stratigraphic position by the locality 

 numbers that may be found in the stratigraphic section. 



Lettering.— A= (65k), B= (64J), C= (64d), D= (641), E= (64f ), 

 F=(64n)'. G=(64p), H=(64o), I = Sarbach, J = Sarbach, K = 

 Messines. 



The limestones and shales of the section are unusually well pre- 

 served, and the section may be studied wherever it is unbroken by 

 faults or not mantled by debris. The fossils found were largely in 

 a fragmentary condition, but careful search may lead to the discovery 

 of localities where more favorable conditions prevailed, as at Mount 

 Stephen and Burgess Pass 40 miles (64.4 km.) to the south-southeast. 

 As yet we do not know of a finely preserved fauna of any consider- 

 able number of species from the Upper Cambrian or Ozarkian forma- 

 tions of the Cordilleran area in western North America. 



To the north along the Continental Divide, the formations shown 

 in Mount Forbes are finely exposed, especially at Thompson Pass and 

 on the alplands southwest of Mount Saskatchewan. 



DEVONIAN (MIDDLE) 

 Messines Formation 



Feet Meters 



I. Cliff-forming, massive-bedded, dark, rough-weathering 

 magnesian limestone. Thickness estimated 1,000 feet 

 (304.8 m.). 

 II 



