NATURAL HISTORY, TORONTO REGION 



very common. The following list gives the commoner 

 fossils : 



Ogygites canadensis. 

 Triarthrus beckii. 



spinosus. 



Lingula cobourgensis. 

 Lingula progne. 

 Rafinesquina alternata. 

 Diplograptus bicornis. 



The Lorraine (Hudson River) shale follows the 

 last formation without a break and extends, as low 

 outcrops, along the shore of Lake Ontario from 

 Toronto to Port Credit. Its best exposures are in the 

 Don Valley brickyard, east of Rosedale, Toronto, 

 along the Humber River south of Lambton Mills, 

 and at a brickyard on the shore of Lake Ontario just 

 weet of Port Credit. 



The shale is grey and non-bituminous, and at 

 intervals of a foot or two there is a layer of impure 

 limestone, which must be selected out before the shale 

 is ground for brick-making. The limy layers are 

 very fossiliferous, and Professor Parks gives a list of 

 more than sixty species foiind along the Don and 

 Humber Rivers. The commonest forms are as fol- 

 lows: 



Diplograptus pristis. 

 Bythopora delicatula. 

 Dekayella ulriehi. 

 Rafinesquina alternata. 



