374 



D B SCEIPTION OF THE 



1. Ferruginous shale, the upper part brecciated, .... 



2. Globular basaltic rock, the globular masses separated by seams of fer- 



ruginous argillite, ...... 



3. 4, 5, 6. Beds of volcanic grit, ...... 



7. Basaltic, sedimentary bed, ...... 



8. Volcanic grit, ........ 



9. 10, 11, 12. Brecciated volcanic grit, amygdaloidal; the partings between 



the layers containing seams of zeolites and calcite, with some thalite ; 

 the upper layers but slightly brecciated, .... 



13. Shaly breccia, ....... 



14. Compact volcanic grit, slightly amygdaloidal, 



15. Volcanic grit, amygdaloidal, slightly brecciated in the lower part of 



the bed, ........ 



16. Volcanic grit, very full of amygdules; soft, and falling into fragments 



when struck. This stratum separates into layers five or six inches 

 thick at some places ; all the layers, however, possessing the same 

 characteristics, ....... 



17. Wrinkled layer; filled with vertical cracks in every direction. These 



cracks are so numerous as to render it almost impossible to procure 

 specimens. This rock, wherever exposed, seems to have been con- 

 siderably water-worn before the deposition of the succeeding bed, . 



18. A compact volcanic grit, purplish-coloured, especially where exposed, 



and divided by vertical joints. At the contact with the underlying 

 bed, it is somewhat brecciated, .... 



19. Wrinkled stratum. The corrugations extend through the whole bed 



It is full of amygdules, containing zeolites. It is separable into 

 thin layers, the top of each layer being corrugated, 



20. Volcanic grit, grayish-coloured ; tolerably compact; few amygdules, 

 20$. Breccia, ....... 



21. Volcanic grit (No. 183) — amygdaloidal, harder and tougher than th 



lower beds, ...... 



22. Globular basaltic bed, ..... 



Feet. 

 5 



4 

 7 

 10 



91 



Inches. 



4 

 10 



Near the mouth of Two Island River, No. 183 comes to the lake-shore again, 

 where it rests upon four feet of breccia, and is overlaid by a sheet of basaltic rock. 

 The corrugated bed comes up to within two hundred yards of the mouth of Two 

 Island River. The dip of these beds is to the southeast at an angle of from 9° to 

 10°. I consider this section interesting, principally showing in detail some of the 

 various beds which make up the heavy deposits of metamorphosed and trap rocks 

 found in the rivers of this neighbourhood. Some of them are, probably, composed 

 entirely of materials evolved at the periods of trap eruptions, while others appear 

 to have been derived in great part from sandstone beds, broken up by the intrusive 

 rocks, and redeposited and cemented under the influence of trappean action. I 

 have called them all by the same name in this section, though it is highly probable 

 that some of the beds do not differ materially from some of the unequivocally meta- 

 morphosed sandstones. 



The rock which forms the " Two Islands," is like No. 629, and bears north 30° 

 east. On the easterly island it assumes a columnar form. 



15. Inaonani River 



— At the mouth of this river there is an exposure of ten feet 



