1911] The Ottawa Naturalist. 191 



5. Gray shale, calcareous in places, with 6 in. 

 pure coarse-grained limestone 4 ft. be- 

 low the top 11 6 16 6 



4. Impure sandy limestone and shale 6 22 6 



3. Hard, greenish limestone with abundance 



of Camarotcechia plena 10 23 4 



2. Greenish limestone and shale, with Cam- 



arotcechia plena near the top 10 33 4 



1. Calcareous shale with thin layers of lime- 



stone and many thin sandy layers. 



Glossina belli common 20 6 S3 10 



Isochilina ? clavigera was not found in No. 7, although other 

 ostracods were plentiful, but this is undoubtedly the clavigera 

 horizon. The hard greenish limestone with Camarotcechia plena 

 outcrops again in a small cutting in Rockcliffe Park., just below 

 the Buena Vista station on the Electric railway, and is especially 

 well shown in the first bluff south of the town at Rockland, 30 

 miles east of Ottawa. 



The strata immediately above the clavigera zone are not 

 fully exposed in any one section, but portions are well shown 

 both at Westboro and at Aylmer. The section at Westboro is 

 as follows : - 



Ft. In. Ft. In. 



13. Rusty dolomite, "cement bed" 2 2 



12. Heavy-bedded, light blue limestone, the 

 upper bed full of large undetermined 



corals 10 9 12 9 



11. Concealed 16 28 9 



10. Heavy-bedded, dark gray limestone. 

 One of the upper layers shows wavy 

 bedding, and the highest layer is full of 

 fossils; Lophospira, Helicotoma, etc. ... 5 33 9 



9. Rusty dolomite, "cement bed" 3 36 9 



8. Black shale and very thin layers of dark 



gray limestone 2 6 39 3 



7. Concealed 1 6 40 9 



6. Blue-black, wavy bedded limestone, Cor- 



nulites and Isochilina abundant 6 46 9 



5. Concealed 2 6 49 3 



4. Cream-colored sandstone, full of black 



phosphatic fragments 3 52 3 



3 . Sandstone and brown shale, the sandstone 



full of badly preserved bryozoans 3 55 3 



2. Black shale with Isochilina? clavigera and 



other ostracods 2 57 3 



1. Blocky, greenish limestone . 1 58 3 



