1853.] 



BIGSBY — GEOLOGY OF QUEBEC. 



93 



Ground Plan of Quebec with the Dips and 



1. Ance des Meres, or Diamond Harbour, at Railed Stairs 



2. Near Inclined Plane (at a high angle) 



3. On Beach andadjacentChff,nearLaPorte's Tavern, ^85° 



4. Half-way between Inclined Plane and Champlain Street 



Strikes. 



strike. 



Dip, 



N.byE. 



vert. 



N.E. 



/N.W. 

 t S.E. 



E.N.E. 



S.S.E. 





r S.E. 



N.E. 



\ vert. 





[ N.W. 



N.byE. 



vert. 



N.W. 



vert. 



N.W. 



S.W. 



N.W. 



S.W. 



N.W. 



S.W. 



N.W, 



S.W. 



N.W. 





N.N.W. 



W.S.W 



N.byW. 



W.byS. 



N.E. 



S.E. 



5. West end of Champlain Street 



6. North end of Sault au Matelot Street 



7. Near this 



8. Near Palace Gate 



9. Road descending into St. Roche suburbs, first from St. 



John's Gate 



10. Outside City walls, near Palace Gate (a conglomerate)... 



11. S.E. of, and near to, St, John's Gate (M. d'Estimau- 



ville's garden) 



12. St. John's Quarries, W.S.W, of No. 11 



13. Ditto (Z50°-80°) 



14. Coarse sandstone, in ditch at St. John's Gate 



The rocks interleaved with the black limestone of Quebec are two 

 kinds of true conglomerate, a coarse gritty sandstone or quartz rock 

 (formerly called greywacke), and grey crystalline limestone. They 

 bear a very small proportion to the general mass of the rock, and are 

 principally observed on the north side of the city, and on the south 

 flank of the Heights of Abraham. 



In Rue Sault au Matelot, the entire face of the cliff overhanging 

 the houses consists of a dark brown calcareous conglomerate, of 

 rounded ash-coloured fragments of very various sizes, scattered spa- 

 ringly through a black cement of the Quebec limestone. It passes 

 into the body of the rock, but the cliff here running for a space with 

 the strike, we see this puddingstone for some hundred yards. 



Near Palace Gate, and so on westward in the cliff overhanging St. 

 Roche's suburbs (see fig. 4), another form of calcareous puddingstone 

 is several times interleaved with the black limestone, dipping S.W, In 

 this the imbedded masses are much more numerous, are seldom an inch 

 square, often angular, and have chlorite and iron-pyrites interspersed. 

 It is well seen in M. d'Estimauville's garden. In St, John's suburbs, 

 400 yards N.E, from this garden, the Matelot Street puddingstone 

 recurs, 12 feet thick; its nodules very small, few, and rounded. Its 

 strike is to the N.W, The layers of light brown semi-crystalline 

 limestone, from a quarter of an inch to 1 5 inches in breadth, referred 

 to above, occur between the suburb of St. John and that of St. Roche, 

 and are intercalated at intervals of some feet from each other. They 

 are not fossiliferous. At present I am only aware of the occurrence 

 of coarse-grained sandstone (the coarse green sandstone of Logan, 

 and described above, p, 91) in the military ditch on the left of St. 

 John's Gate, and on Cape Diamond, The former bed is visible for 

 50 yards, and dips to the S.E. at a high angle. It is in one part 

 12 feet thick, and slowly narrows to 6 feet. Of the mass at Cape 

 Diamond little is seen. It can scarcely belong to the bed at St. 

 John's Gate. 



