NATURAL HISTORY, TORONTO REGION 
very common. The following list gives the commoner 
fossils : 
Ogygites canadensis. 
Triarthrus beckii. _ 
is 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 
west 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 found along the Don and 
Humber Rivers. The commonest forms are as fol- 
lows: 
Diplograptus pristis. 
Bythopora delicatula. 
Dekayella ulrichi. 
Rafinesquina alternata. 
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