558 NEW YORK STATE MUSEUM 



«i(le of the St Lawrence river. These contained only the asso- 

 ciation characteristic of the next higher Deej) kill zone, and it 

 was placed provisionally in the Chazy. Lapworth added that 

 there are certainly several zones at Point Levis, and that, by 

 analojry with the English series, he would place the zone last 

 named at about the middle of the series. This conclusion is fully 

 verified by the actual succession of the zones in the Deep kill 

 section. 



A very thorough account of the history of the problem of the 

 <^uebec terrane hae been given by R. W. Ells,^ accompanied by 

 •extensive fossil lists from all outcrops of the Quebec region, 

 prejiared by Dr Ami. The succession of the larger divisions of 

 the Quebec terrane is therein clearly set forth. Dr Ells con- 

 cludes in this paper that the evidence afforded by the strati- 

 grai)hy and by the graptolites determined by Prof. Lapworth, is 

 «utticient to refer the Sillery rocks (1-4) to the Cambric 

 «ystem, and the Levis beds (5) to the lower Ordovician. He sug- 

 gests that the term '' Levis ■' be used for the local development 

 •of the Calciferous (Beekmantown) terrane about Quebec. These 

 Levis beds measure, according to Logan, about 2000 feet in thick- 

 ness. As the Deep kill beds contain the greater part, if not all, 

 of the graptolites which have become known from the Levig 

 beds, they represent a southern continuation of the same, or, 

 more exactly speaking, of the graptolite shales contained in the 

 Ix^is beds; for the conglomerate bands of the Levis region with 

 their interesting fauna, both in the matrix and boulders, are 

 ^apparently wanting here. 



In reviewing Dr Ells's report, Mr Walcott^ states that in 

 188) he found together with Dr Ells the typical Calciferous 

 fauna in the matrix of the conglomerate bands in the Levis beds, 

 while the boulders contain the Potsdam fauna. The mixing of 

 these two large faunas has been the cause of much of the con- 

 fusion and mystery surrounding for so long a time this part of 

 the Quebec terrane. 



' iii'itl iiat. hist. sur. Canada. lU'p't ISSii. 2d ser. v. 3, pt 2, 12 k ff. 

 *Ani. jour. sci. 1890. 3d ser. 39:101 ff. 



