HAMILTON CROUP. . 59 



The highest beds observed on Khagashewung Point are thin- 

 bedded, light-colored, brittle limestone ledges, lying in a few places 

 on top of the brownish dolomite rock. From the saccharoidal, 

 compact beds of the dolomite can be obtained good-sized blocks, 

 which would answer for building purposes, being of sufficient 

 durability and easily dressed. The position of the outcrops near 

 the lake shore is very favorable for the opening of quarries, and 

 for the transportation of the rock by vessels. 



An analysis of this dolomite gives : 



Carbonate of lime 58 per cent. 



" magnesia, 38 " 



Alumina and iron oxide hydr. . . 1.5 " 

 Insoluble residue 0.5 " 



West of Khagashewung, to the mouth of Pine River, the shore pre- 

 sents numerous other outcrops of the beds below those forming the 

 point, which, however, rarely emerge more than a few feet above the 

 water level. Proceeding from the point westward, we first find the 

 beds containing an abundance of Stromatopora, of which, in the 

 dolomites of the cliffs, not a single specimen could be found. Fur- 

 ther on, below the Stromatopora beds, light-colored, brittle lime- 

 stones with conchoidal fracture are brought to the surface by the 

 undulations of the strata ; in places, these beds are rich in fossils, 

 in others not. Strophodonta nacrea, Strophodonta demissa, Stro- 

 phodonta erratica, Chonetes Emmetensis, Spirifer pennatus, Spi- 

 rifer mucronatus, Cyrtina Hamiltonensis, Terebratula Linklaeni, 

 Atrypa reticularis, Spirigera concentrica, Pentamerus papilionensis, 

 several forms of Bryozoa and corals, and some rare forms of Trilo- 

 bites have been collected from them. In a few spots the still 

 lower beds of hard blue limestone with Cyathophyllum profundum 

 and Favosites Hamiltonensis, in alternation with black shale seams, 

 are noticed. The blue fossiliferous shale beds (acervularia beds 

 of Winchell) just reach the surface in the lake bottom half a mile 

 west from the dock of Charlevoix. On the point, 3 miles 

 ■west from the dock, some larger outcrops border the lake shore 

 in low cliffs, elevated 5 or 6 feet above water-mark. Lowest is the 

 blue, hard lime rock with Cyathophyllum profundum, Favosites 

 Hamiltonensis, Atrypa reticularis, etc., and above are light-colored, 

 smooth-fracturing, brittle limestones with seams of shale, which are 



