PART OF TUE PIIOVINCB OF QUEBEC. 121 



beds below Matane. This classification has, by the study of the last few years, been care- 

 fully coufirmod, not ouly by the age of the associated strata iu every case, but of the char- 

 acter aud horizon of the fossils obtained from the diflerent series, so that there is no doubt 

 that the conglomerates of the Sillery formation contain an older and entirely distinct fauna 

 than the Levis beds, while those of the city of Quebec are decidedly newer again than 

 the Levis. The Potsdam fauna of many of the pebbles iu the Levis conglomerates and 

 the Calciferous fauna found iu the matrix serves to fix the position of the middle zone 

 with sufficient accuracy, and to furnish us with a reliable basis for other determinations. 

 The only place where the Levis conglomerates is found, outside of the Levis rocks them- 

 selves, is on the south-west extremity of the Island of Orleans, unless we except the limi- 

 ted bands of Cape Rosier and Ste. Anne des Monts, already referred to. In composition 

 the conglomerate of the Levis differs greatly from that of the Sillery. Thus the former 

 passes frequently into a massive limestone, and many of the contained boulders are large 

 while others are small aud composed also of other previously formed limestone conglome- 

 rate, with generally a calcareous paste, though in its lowest part this becomes somewhat 

 siliceous. 



The Sillery conglomerate is generally composed of hard limestone pebbles, with others 

 of hard sandstone and of cjuartz, the sources of which cannot be ascertained from any 

 beds known at present in the vicinity of the River St. Lawrence where these conglome- 

 rates are found. The most probable hypothesis is therefore as suggested that their source is 

 the Greorgia sandrock which has been faulted out in this section. 



The conglomerates of the Trentou-Utica have as yet been but little studied. Some 

 forms from the pebbles of Mountain Hill in Quebec appear to be Chazy or lower Trenton 

 in character, but these require further examination before their true position can be satis- 

 factorily settled. 



The section going south-east from Levis to the boundary of Maine, nearly sixty miles 

 distant, passes over Sillery rocks of the Cape Rouge section for about half this distance, 

 which become gradually harder and more metaraorphic as they approach the crystalline 

 schists of the Buckland hills. In these schists a well defined anticlinal structure is seen, 

 which can be followed south-west and is continuous with that seen iu the Sutton moun- 

 tain range. The crystalline schist range of Buckland has a breadth of about ibiir miles, 

 and on the east is Hanked by the green slates and quarzites of Cambrian age which, however, 

 are soon overlapped by the Cambro-Silurian slates, sandstone and dark limestone of the 

 valley of the Daquaam and upper St. John rivers which here constitute a great stretch 

 of generally level and thickly wooded country, which stretches across into Maine, in which 

 direction its south-eastern limit has not been traced. 



The limited extent of the Levis formation proper can be seen in the fact that the 

 principal area itself is no more than two and a half miles in length by one mile and a half 

 in width, while the other area on the Island of Orleans has less than one square mile, being 

 cut otf on both sides by faults ; that on the south separating it from the Sillery which is 

 thrust upward into an apparent overlying or newer position, while the second fault on 

 the north has placed the Levis, by a similar overthrust, above the Trenton-Utica. The 

 formation does not appear on the north side of the St. Lawrence, being probably cut off 

 by the fault which passes in front of the citadel, or else, if formerly existing there, it has 

 been removed by the denundation which has been very great over the whole of Eastern 



Sec. IV, 1891. 16. 



