560 Annals of the Carnegie Museum. 



Liiigii/a lyelli r, Modiolopsis scnvteri c. 



Ctenodonta par vi dens c, 



A.. Sandstone with the preceding. 



Caiuarota'chia plena r, Modiolopsis sowteri c. 



A^. Impure yellowish limestone. 



Ctenodonta %\i. ind., Holopea f>\). ind., 



Raphistoma staniiiicum c, Leperditia canadensis c. 



A.. Thin-bedded, friable shale. 



BeyricJiia clavigera, Priinitia sp. ind. 



Beyrichia clavigera clavifracta, 



Ag. Dark gray, quite pure limestone. 



Modiolopsis sowteri R, Leperditia canadensis a. 



Modiolopsis pan'iiiscula c, 



A,,. Thin-bedded, shaly, dark blue to gray limestone on the hill east 

 of Aylmer. 



Lingula lyelli r, Orthoceras allumcttense ? r, 



Rafinesquina alter nata / r, Isochilina ottaioa a, 



Modiolopsis breviuscula a, Isochilina aniiana c. 

 Raphistoma stamineum , 



A,g. Impure, dolomitic limestone overlying the Aylmer sandstone 

 about five miles above Aylmer. 



Caniarota'chia plena, Bathyurits angelini. 



lo. Allumette Island, So miles northwest of Ottawa. 



Lingula lyelli c, Orthoceras alluniettense. 



Pleiirotoniaria or Holopea, 



Comparison of the Fauna of the Aylmer Sandstone with that of 

 the Overlying Limestone. 

 Sandstone. Limestone. 



Lingula lyelli, Lingula lyelli, 



Camarotcechia plena, Camarotxchia plena, 



Camarotcechia orientalis, Rafinesquina alternata ?, 



Hebertella imperator, 



