ILLUSTRATIONS 



PLATES 



' FACE PAGE 



1. (Map.) Area from northern headwaters of Saskatchewan 



River southeasterly along Continental Divide for about 



165 miles (265.5 kn^-) 8 



2. (i) Silurian Beaverfoot formation limestones of upper 



clififs of the Gates of the Canyon 10 



(2) Gates of the Canyon above the entrance to Sinclair 

 Canyon from the Columbia River Valley 10 



3. West face of Red Wall Fault Breccia facing fault line. ... 10 



4. ( I ) Southwest face of Sinclair Motmtain above - Sinclair 



Canyon 10 



(2) Limestone boulders of Red Wall Fault Breccia 10 



5. Gates of the Canyon fault above the entrance on the north 



side of Sinclair Canyon 10 



6. Fault in Mons limestones, Sinclair Canyon 10 



7. (i.) Looking across Columbia River Valley to the west face 



of Stanford Range between Stoddart Canyon on right 



and Dry-Creek Canyon on left 20 



(2.) Southwest end of Sabine Mountain 20 



8. A larger scale view of the formations adjoining Sinclair 



Canyon 20 



9. Amecephalus piochensis (Walcott), Anoria tontocnsis 



(Walcott), Belief ontia collieana (Raymond), Heiuigy- 

 raspis affinis (McCoy), Niohe frontalis (Dalman) 60 



10. Annonia pelops Walcott, Burnetia urania (Walcott), Irvin- 



gella major Ulrich and Resser, Chancia ehdome Walcott, 

 Corbinia horatio Walcott, Cedaria prolifica Walcott, 

 Crusoia cebes Walcott, Elkia nasuta (Walcott) 60 



11. Dokimoce phalli s pcrnasutus (Walcott), Dunderbergia nitida 



(Hall and Whitfield), Elvinia roemeri (Shumard), 

 Elrathia kingii (Meek), Ptychoparia striata (Corda) ... 60 



12. Enrekia granulosa Walcott, Maladia americana Walcott, 



Moxomia hecuba Walcott, Housia varro (Walcott), 

 Hardyia metion Walcott, Iddingsia similis (Walcott), 

 Modocia oiueni (Meek and Hayden) 60 



(vii) 



