STATE GEOLOGIST. 69 



ence. Mr. Francis Bhowed me hew excellent crops of Indian 

 corn, potatoes and oats. 



9. — Hamilton Group, 

 On the east side of Thunder Bay Island, the rocks of the 

 Helderberg Group are Been overlain by I Mack bituminous 

 limestone, abounding in Atrypa reticularis, and uumeroui 

 Brachi Is allied to the types of this group. The locality 

 furr. wo or three Species of trilobites, a J 



a large COral allied to Acervularia and BOme fisll remains. The 



in every direction, and abounds in partings of dark 



■haly matter. 



The same beds are again seen at Carter's quarry, two or 

 three miles above the mouth of Thunder Bay river, and here it 

 contains the same fossils. It i jain on the south shore of 



Little Traverse I; te with Brachiopods and Bryozoa, and 



is here eighteen Ant thick. It is overlain by two feet of dark 

 che- lored, compact, argillaceous limestone, much shat- 



tered, and abounding in Cyathophylloids and other corals, 

 which, in turn, is surmounted by 14 feet of a limestone varying 

 from calcareous and crystalline to argillaceous, in beds from 2 to 

 24 inches thick. The whole series is completed by 6 inches of 

 black -hale. 



The exact order of superposition of all the rocks constituting 



Hamilton Group, has nowhere bean observed. The bluff at 



'ridge Point, in Thunder Bay, is believed to come in next 



above the bituminous lim< ' the localities ju»t cited. The 



k here is at bottom, a bluish, highly argillaceous limestone, 



with shaly interlaminations, the wh iderfully storked 



with the remairu . and nota few encrinital Btems 



N • of Encrinit . could be found, except two 



Pen ,;, along th<- beach, ai 



found in plsj \ t thick, 



of blue : hick, calca re >ua in 



plaees, and irregularly inter i witli blue, 



limei It contai lebitas, 



