28 
The MacLaren Landing section, which follows, contains the 
beds corresponding to the section at Ottawa and Rockland, but 
also includes the Chazy limestones and shales. A good Chazy 
section of the lower sandstones and shales occurs at Aylmer, on 
the north shore of Ottawa river about 10 miles above Ottawa, 
but the amount of limestone exposed is not great, and the 
fossils apparently are not numerous. 
Section at MacLaren Landing 
Ft. 
10. Coarse limestone, dove-tinted grey on fracture, weathering grey, 
fossils numerous 10 
9. Limestone, weathering lighter than above. Fossils not numerous. 12 . 
Base of Trenton. 
Covered 11 
8. Thicker bedded, fine-grained limestone, weathering lighter, con- 
choidal fracture 9 
Covered 6i 
7. Fine-grained, grey limestone,. containing cephalopods, stromato- 
poroids, and also chert 6£ 
Covered 7 
6. Lighter grey than above, containing chert beds 1 ft. to U ft. 
thick 8 
Base of Leray beds of Black River. 
5. Light grey beds. Tetradium very common 7 
Base of exposed strata of Lowville beds of Black River. 
Covered 25 
4, Light grey limestone, filled with fossils, gastropods predominating 1£ 
3. Green-tinted limestone, alternating with light grey. The beds at 
the base showing red streaks when freshly fractured, contain 
Camarotcechia plena and fucoid markings 11 
Covered 3 
Thin beds, fine-grained, no fossils 3 
Covered 8 
Grey limestone, red-streaked, much disturbed 1£ 
Covered ■. 5 
2. Interbedded shale and thin limestone layers, ostracods numerous 
in some layers 10 
1. Thick-bedded, dark grey, impure limestone, somewhat arenaceous. 
Badly broken up by weathering 10 
Base of Chazy (omitting the interbedded sandstone and shale 
member to the west) 
Total 165 
