1853.] BIGSBY — GEOLOGY OF QUEBEC. 97 



matrix, but differ in the condition and kind of their imbedded 

 materials. 



No. 1 is the same as that of Matelot Street, Quebec. 



No. 2 resembles that near the Palace Gate, Quebec. 



No. 3 is No. 2, but full of minute irregular bodies of hyaline quartz. 



No. 4. The materials of this conglomerate are both angular and 



rounded, and are veined with calc-spar ; and it contains also some 



few round masses of quartz, white and brown, as large as nuts. 

 No. 5 nearly the same as No. 2, but with lumps of green clay. 

 No. 6 ditto, but with long slips of the red titaniferous clay-slate of the 



district. 

 No. 7 dark-coloured, full of fragments of the Trenton limestone of 



Lorette. 



Two layers of the Matelot Street conglomerate occur east of, and 

 near to, the pier at Lauzon, one being 15 feet thick. The other, 

 nearly as large, undergoes a shift or fault close to the cliff. 



The following local sections of these alternating strata (figs. 5 & 6) 

 sufficiently represent the appearances frequently occurring here. 



These interesting phsenomena are met with on the first road lead- 

 ing up the hill to the west from the Ferry Wharf. The natural ledge 

 which has here been taken advantage of for a I'oad has been widened 

 by paring away the rock on the left hand so as to display on a vertical 

 surface many of the alternations under notice, as well as a remarkable 

 set of contortions. These alternations occur in the upper third of 

 the ascent, 200-250 feet in total height, and in the follovdng order, 

 descending from the top of the hill : — 



1 . The lower part of 37 feet of dark brown Graptolite shale. 



2. A seam of calcareous conglomerate ; pebbles large. 



3. A few layers of shale. 



4. Brown crystalline limestone, 6 inches thick. 



5. Conglomerate No. 2 repeated. Towards the roof the pebbles 



are smaller. 



6. Limestone, the same as No. 4. 



7. Shale. 



8. Limestone as No. 4, 8 inches thick. 



9. Parti-coloured shale, 18 inches thick. 



10. Calcareous conglomerate, 4 feet thick, with long slips (4-6 



inches) of black and brown shale ; pebbles very large. 

 N.B. The same exists on Quebec Ridge, near Marchmont. 

 (See Map, PI. VI.) 



1 1 . Thirty feet of clay-slates or shales, grey crystalline limestones 



vvdth dots of hyaline quartz, calcareous conglomerate with 

 rather small pale pebbles, and another conglomerate with 

 pebbles of black limestone, dots of hyaline quartz, and 

 masses of green clay ; all in conformable strata, varying in 

 thickness from 6 inches to 4 feet, shales, of different colours, 

 predominating in quantity. 



Next below this set of strata come a nearly perpendicular set of 



