262 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Feet Meters 



slabby layers suggest that they were deposited as 



sHghtly arenaceous slimy muds in a shallow body of 



water 285 86.9 



Fauna. — No traces of trails or any form of life were 

 observed on the line of the section or at other locali- 

 ties along the outcrop on Ghost River. 



CAMBRIAN 

 Upper and Middle Cambrian Formations 



1. Thin-bedded gray limestone with abundant annelid trails 



on weathered surfaces 252 76.8 



2. Gray and bluish-gray, thin-bedded limestones that break 



down and usually form a shelf or terrace between the 



cliffs above and below 40 12.2 



3. Massive-bedded, cliff-forming gray limestone, breaking 



down into thinner layers on weathered slopes 830 253.0 



Total 1,122 342.0 



This series of beds cannot now be subdivided into formations, as the 

 laboratory study of the fossils has revealed the presence of several faunas 

 not noted in the field. The Ptarmigan Albcrtclla, the vStephen Glossoplciira 

 boccar, and the Uppsr Cambrian Ptychasf^is faunas are represented in the 

 collections. Whether the intervening Cathedral or Eldon formations are 

 represented by some of the unfossiliferous beds cannot be determined from 

 the information now in hand. 



Lower Cambrian 



Directly across from the mouth of Ghost River Canyon, and a little 

 south of it, the river has cut into the w^estern base of Marsh Mountain ' 

 so as to expose a series of thin-bedded gray sandstones, and greenish 

 and purpHsh shales. The surfaces of the thin layers of sandstone 

 are almost covered with trails of small and large annelids, and bits 



* Marsh Mountain (8,000 feet, 2,438.4 m.) is a name that I have given to 

 a mountain outlier that rises in front of the main line of cliffs a little to the 

 northeast of the mouth of Ghost River Canyon ; its summit is about 5 miles 

 (8 km.) east of the bold cliff of Devils Head (9,204 feet, 2,805 m-) and about 

 51 miles (82.1 km.) west of Calgary, from where both summits can be seen 

 against the western sky line. 



Marsli Mountain is formed of a mass of Middle Cambrian limestone that 

 has been pushed eastward over onto the Cretaceous shales and limestones on 

 the line of a great thrust fault extending all along this portion of the Rocky 

 Mountain front ; as the limestones are of the same age as those of the lower 

 portion of the eastward facing cliffs to the westward, it is probable that a 

 north and south fault occurs along the western side of the mountain. 



The name Marsh is derived from the large marsh at the southeastern base of 

 the mountain. 



