BULL. GEOL. SOC. AM. 



VOL. 30, 1918, PL. 12 





r- --—'^'wfe^ 





''^'^^T'f'^lti/''3^^v. i->2i^*^: ^ ^^- .^^':vJ;.'--^'-•'- 



Figure 1. — View of the fine-graixed. thix-bedded Limestone inclined on the Flanks of the 

 coral-reef rock ; exposed along severn river 



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FiGCRi: 2. — "S'lKW siioAYixG Tin; rxs ruA tifikd ii:RE(;rLAU Character of the Attawapiskat coral- 

 reef Rock ; exfosed along Ekwan River 



DOME OF CORAL-REEF ROCK, AND FINE-GRAINED LIMESTONE INCLINED ON THE FLANKS 



OF SUCH DOMES 



