1911] The Ottawa Naturalist. 193 



11. Massive buff limestone, the whole surface 

 covered with Phytopsis tuhulosum and 

 Teiradiiim cellulosum 9 15 



10. Concealed. Loose fragments of limestone 

 with surface covered with Beatricea 

 were seen just above the top of No. 9. 



About.. . . 6 21 



Shalv, buff limestone with Onchometopus 



5twp/e.r and numerous large ostracods. . 3 10 24 10 

 Light buff limestone, thin-bedded at top 



and heavy-bedded at bottom 7 6 32 4 



7. Concealed, below quarry 5 37 4 



6. Rusty vellow dolomite, "cement beds.". .5 42 4 

 Massive blue-black and dark grav lime- 

 stone 10 6 52 10 



Hard, cream-colored sandstone with 



Vanuxemia and other lamellibranchs. .3 55 10 



Mostly concealed, but with two layers of 



hard, dark blue limestone exposed. ... 5 2 61 



2. Thin-bedded shale 2 63 



1. Impure, dark blue, heavy-bedded lime- 

 stone with large ostracods, Cyrtodonta, 

 and Bathyurus angelini 2 3 65 3 



No. 4 of this section is believed to be the same as No. 6 of 

 the section at the Hogs Back. No. 5 is the same as the cement 

 beds which were formerly quarried at the Ottawa river at 

 Mechanicsville, and at that locality there is a thick layer of 

 dolomitic limestone 3 feet below the base of the cement beds, 

 which vielded the types and a large number of other specimens 

 of the Bathyurus superbus described by the writer in the Novem- 

 ber (1910) number of The Ottawa Naturalist. 



The laver with Beatricea, which is not well shown in this 

 section, is an important one. It is especially well exposed near 

 the top of the hill north of Aylmer, and it may also be seen about 

 15 feet below the base of the Black River at Mechanicsville. 

 The section along the river at Mechanicsville is an excellent one 

 for showing the upper and most fossiliferous part of the Lowville. 

 It is as follows: 



Ft. In. Ft. In. 

 9. 6 feet of shaly and nodular V)lue-black 

 limestone, resting on 8 feet of heavy- 

 bedded, impure, dark gray limestone. 

 Strophomena incurvata, Maclurites 

 logani, Columnaria halli, Gonioceras 

 anceps, etc. Black River 14 14 



