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Canadian Record of Science. 



thus be regarded as one of the great calcareous systems, 

 comparable with those of the Pakeozoic period, which it 

 also rivals in its association with carbonaceous and ferru- 

 ginous, deposits. Though minute globular forms, probably 



Fig. 2. — Arrangement of beds in valley of Calumet River — (a) Upper 

 gneiss ; (h) Limestone partly covered with soil ; (c) Included 

 bed of gneiss ; {<!) Lower gneiss. 



organic, have been found in the Middle Limestone, that of 

 Long Lake, Eozoon proper is confined, so far as known, to 

 the Upper Limestone, known specially as the Grenville 

 Band. This band and its accompaniments I have myself 

 studied in the region north of the Ottawa, at the Augment- 

 ation of Grenville, near the Calumet, in the quarries 

 opposite Lachute, at C6te St. Pierre, at Montebello, at 

 Buckingham, and Templeton, as well as in some of the 

 districts west of the Ottawa, where the same limestone is 

 supposed to recur. Everywhere it is a large and regular 

 bed, sometimes with even strike and dip, but at intervals 

 thrown into violent contortions along; with the enclosing 

 beds, in the manner usually seen in disturbed strata of 

 later age, where it is common to find portions little 

 affected by plication alternating w T ith strongly folded beds 

 having the harder ones dislocated ; others are merely bent 

 or folded (Figs. 4 and 5). It presents subordinate beds of 

 different qualities, dolomitic, serpentinous, or graphitic, 

 and is immediately associated with thin-bedded, fine- 

 grained gneisses, quartzite, and biotitic and hornblendic 

 schists. In some beds it has disseminated crystals of min- 

 erals usually found in metamorphic limestones, while in 

 others there are concretionary masses, nodules and grains 

 of serpentine and pyroxene. Eozoon in masses occurs 

 only in certain layers, most frequently in those which are 

 serpentinous, but a careful examination detects in many 

 layers, not showing perfect examples of Eozoon, small 



